2017-28423. Air Quality Designations for the 2010 Sulfur Dioxide (SO2

AGENCY:

Environmental Protection Agency (EPA).

ACTION:

Final rule.

SUMMARY:

This final rule establishes the initial air quality designations for certain areas in the United States (U.S.) for the 2010 sulfur dioxide (SO₂) primary National Ambient Air Quality Standard (NAAQS). The Environmental Protection Agency (EPA) is designating the areas as either Nonattainment, Attainment/Unclassifiable, or Unclassifiable. The designations are based on application of the EPA's nationwide analytical approach and technical analysis, including evaluation of monitoring data and air quality modeling, to determine the appropriate designation based on the weight of evidence for each area. The Clean Air Act (CAA or Act) directs areas designated Nonattainment by this rule to undertake certain planning and pollution control activities to attain the SO₂ NAAQS as expeditiously as practicable. This is the third of four expected sets of actions to designate areas of the U.S. for the 2010 SO₂ NAAQS.

DATES:

The final rule is effective on April 9, 2018.

ADDRESSES:

The EPA has established a docket for this action under Docket ID No. EPA-HQ-OAR-2017-0003. All documents in the docket are listed in the index at http://www.regulations.gov website. Although listed in the index, some information is not publicly available, e.g., Confidential Business Information or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, is not placed on the internet and will be publicly available only in hard copy form. Publicly available docket materials are available either electronically in the docket or in hard copy at the Docket, WJC West Building, Room 3334, 1301 Constitution Avenue NW, Washington, DC 20004. The hours of operation at the EPA Docket Center are 8:30 a.m.-4:30 p.m., Monday-Friday. The telephone number for the Public Reading Room is [phone]. Air dispersion modeling input and output files are too large to post in the docket or on the website and must be requested from the EPA Docket Office or the Regional office contacts listed in the FURTHER INFORMATION section.

In addition, the EPA has established a website for the initial SO₂ designations rulemakings at: https://www.epa.gov/​sulfur-dioxide-designations. The website includes the EPA's final SO₂ designations, as well as state and tribal recommendation letters, the EPA's modification letters, technical support documents, responses to comments and other related technical information.

FOR FURTHER INFORMATION CONTACT:

For general questions concerning this action, please contact Liz Etchells, U.S. EPA, Office of Air Quality Planning and Standards, Air Quality Policy Division, C539-01, Research Triangle Park, NC 27709, telephone [phone], email at [e-mail]. The EPA contacts listed at the beginning of the Supplementary Information can answer questions regarding areas in a particular EPA Regional office.

SUPPLEMENTARY INFORMATION:

U.S. EPA Regional Office Contacts:

Region I—Leiran Biton, telephone [phone], email at [e-mail].

Region II—Ken Fradkin, telephone [phone], email at [e-mail].

Region III—Ruth Knapp, telephone [phone], email at [e-mail].

Region IV—Twunjala Bradley, telephone [phone], email at [e-mail].

Region V—John Summerhays, telephone [phone], email at [e-mail].

Region VI—Bob Imhoff, telephone [phone], email at [e-mail].

Region VII—David Peter, telephone [phone], email at [e-mail].

Region VIII—Adam Clark, telephone [phone], email at [e-mail].

Region IX—Anita Lee, telephone [phone], email at [e-mail].

Region X—John Chi, telephone [phone], email at [e-mail].

The public may inspect the recommendations from the states, territories and tribes, our recent letters notifying the affected states, territories, and tribes of our intended designations, and area-specific technical support information at the following locations:

Regional offices	States
Dave Conroy, Chief, Air Programs Branch, EPA New England, 5 Post Office Square, Suite 100, Boston, MA 02109-3912, [phone]	Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont.
Richard Ruvo, Chief, Air Programs Branch, EPA Region II, 290 Broadway, 25th Floor, New York, NY 10007-1866, [phone]	New Jersey, New York, Puerto Rico and Virgin Islands.
Maria A. Pino, Acting Associate Director, Office of Air Program Planning, EPA Region III, 1650 Arch Street, Philadelphia, PA 19103-2187, [phone]	Delaware, District of Columbia, Maryland, Pennsylvania, Virginia and West Virginia.
R. Scott Davis, Chief, Air Planning and Implementation Branch, EPA Region IV, Sam Nunn Atlanta Federal Center, 61 Forsyth, Street, SW, 12th Floor, Atlanta, GA 30303, [phone]	Alabama, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina and Tennessee.
John Mooney, Chief, Air Programs Branch, EPA Region V, 77 West Jackson Street, Chicago, IL 60604, [phone]	Illinois, Indiana, Michigan, Minnesota, Ohio and Wisconsin.
Alan Shar, Acting Chief, Air Planning Section, EPA Region VI, 1445 Ross Avenue, Dallas, TX 75202, [phone]	Arkansas, Louisiana, New Mexico, Oklahoma and Texas.
Mike Jay, Chief, Air Programs Branch, EPA Region VII, 11201 Renner Blvd., Lenexa, KS 66129, [phone]	Iowa, Kansas, Missouri and Nebraska.
Monica Morales, Air Program Director, EPA Region VIII, 1595 Wynkoop Street, Denver, CO 80202-1129, [phone]	Colorado, Montana, North Dakota, South Dakota, Utah and Wyoming.
Anita Lee, Air Planning Office, EPA Region IX, 75 Hawthorne Street, San Francisco, CA 94105, [phone]	American Samoa, Arizona, California, Guam, Hawaii, Nevada, Northern Mariana Islands, Navajo Nation and the Hopi Tribe.
Debra Suzuki, Manager, State and Tribal Air Programs, EPA Region X, Office of Air, Waste, and Toxics, Mail Code OAQ-107, 1200 Sixth Avenue, Seattle, WA 98101, [phone]	Alaska, Idaho, Oregon and Washington.

The information can also be reviewed online at https://www.epa.gov/​sulfur-dioxide-designations and in the public docket for these SO₂ designations at https://www.regulations.gov under Docket ID No. EPA-HQ-OAR-2017-0003.

Table of Contents

The following is an outline of the Preamble.

I. Preamble Glossary of Terms and Acronyms

II. What is the purpose of this action?

III. What is the 2010 SO₂ NAAQS and what are the health concerns that it addresses?

IV. What are the CAA requirements for air quality designations and what action has the EPA taken to meet these requirements?

V. What guidance did the EPA issue and how did the EPA apply the statutory requirements and applicable guidance to determine area designations and boundaries?

VI. What air quality information has the EPA used for these designations?

VII. How do the Round 3 designations affect Indian country?

VIII. Where can I find information forming the basis for this rule and exchanges between the EPA, states and tribes related to this rule?

IX. Environmental Justice Concerns

X. Statutory and Executive Order Reviews

A. Executive Order 12866: Regulatory Planning and Review and Executive Order 13563: Improving Regulation and Regulatory Review

B. Executive Order 13771: Reducing Regulations and Controlling Regulatory Costs

C. Paperwork Reduction Act (PRA)

D. Regulatory Flexibility Act (RFA)

E. Unfunded Mandates Reform Act (UMRA)

F. Executive Order 13132: Federalism

G. Executive Order 13175: Consultation and Coordination With Indian Tribal Government

H. Executive Order 13045: Protection of Children From Environmental Health and Safety Risks

I. Executive Order 13211: Actions That Significantly Affect Energy Supply, Distribution or Use

J. National Technology Transfer and Advancement Act (NTTAA)

K. Executive Order 12898: Federal Actions To Address Environmental Justice in Minority Populations and Low-Income Populations

L. Congressional Review Act (CRA)

M. Judicial Review

I. Preamble Glossary of Terms and Acronyms

The following are abbreviations of terms used in the preamble.

APA Administrative Procedure Act

CAA Clean Air Act

CFR Code of Federal Regulations

DC District of Columbia

EO Executive Order

EPA Environmental Protection Agency

FR Federal Register

NAAQS National Ambient Air Quality Standards

NTTAA National Technology Transfer and Advancement Act

OMB Office of Management and Budget

SO₂ Sulfur Dioxide

SO_X Sulfur Oxides

RFA Regulatory Flexibility Act

UMRA Unfunded Mandate Reform Act of 1995

TAR Tribal Authority Rule

TAD Technical Assistance Document

TSD Technical Support Document

U.S. United States

II. What is the purpose of this action?

The purpose of this final action is to announce and promulgate initial air quality designations for certain areas in the U.S. for the 2010 SO₂ NAAQS, in accordance with the requirements of the CAA. The EPA is designating areas as either Nonattainment, Attainment/Unclassifiable, or Unclassifiable, based on the definitions described in Section IV in this preamble, and based on evaluating any available information, including (but not limited to) appropriate modeling analyses and/or monitoring data.

This is the third round of designations for the 2010 SO₂ NAAQS. As discussed in Section IV of this document, the EPA is designating SO₂ areas in multiple rounds. The EPA completed the first round of SO₂ designations in an action signed on July 25, 2013 (78 FR 47191; August 5, 2013). In that action, the EPA designated 29 areas in 16 states as Nonattainment, based on air quality monitoring data. In the second round of SO₂ designations, in actions published on July 12, 2016 (81 FR 45039), and December 13, 2016 (81 FR 89870), the EPA designated 65 additional areas in 24 states: 7 Nonattainment areas, 41 Unclassifiable/Attainment areas and 17 Unclassifiable areas. In this third round, 6 areas are being designated Nonattainment; 23 areas are being designated Unclassifiable; and the rest of the areas covered by this round in all states, territories, and tribal lands are being designated Attainment/Unclassifiable. In a future fourth round, the EPA expects to designate all remaining undesignated areas (approximately 50 areas) where states have installed and begun timely operation of a new SO₂ monitoring network.

The list of areas being designated in the affected states and the boundaries of each area appear in the tables for each state within the regulatory text at the end of this document. For areas in this action that meet our definition of “Attainment/Unclassifiable,” the EPA notes this inversion, from previous rounds, of the order of the words “Attainment” and “Unclassifiable” in the amended term “Attainment/Unclassifiable area” has no consequence itself, and that there are no regulatory consequences of this change in, or clarified interpretation of, terminology to the areas in which the terms “Attainment/Unclassifiable” or “Unclassifiable” are applied. For consistency, we are also inverting the order of “Attainment” and “Unclassifiable” for areas previously designated in Round 2 (81 FR 45039 and 81 FR 89870). This re-ordering of the terms has no regulatory consequence and does not revisit the determinations made in Round 2 for these areas. The EPA believes this change is consistent with Congress's definition of “Attainment area” in CAA section 107(d)(1)(A)(ii), and will improve public understanding and make clearer what regulations apply to areas designated in this way, which states have commented they believe is important for the economic development of such areas.

These designations are based on the EPA's nationwide analytical approach and technical assessment of and conclusions regarding the weight of evidence for each area, including but not limited to available air quality monitoring data or air quality modeling. With respect to air quality monitoring data, the EPA considered data from at least the most recent three calendar years 2014-2016 as available. In the modeling runs conducted by states or third parties, the impacts of the actual emissions for recent 3-year periods (e.g., 2012-2014, 2013-2015, 2014-2016) were considered. In some cases, the modeling evaluated current allowable emissions limits in lieu of or as a supplement to modeling of actual emissions. As described in Section VI and in limited circumstances, the EPA may consider early certified 2015-2017 monitoring data or other documentation that demonstrates Attainment. This information would need to be submitted to the EPA by February 28, 2018. For the areas being designated Nonattainment, the CAA directs states to develop and submit to the EPA State Implementation Plans (SIPs) within 18 months of the effective date of this final rule, that meet the requirements of sections 172(c) and 191-192 of the CAA and provide for Attainment of the NAAQS as expeditiously as practicable, but not later than 5 years from the effective date of this final rule.

In 2010, the EPA issued a notice of final rulemaking that revised the primary SO₂ NAAQS (75 FR 35520; June 22, 2010) after review of the existing primary SO₂ standards promulgated on April 30, 1971 (36 FR 8187). The EPA established the revised primary SO₂ NAAQS at 75 parts per billion (ppb) which is attained when the 3-year average of the annual 99th percentile of 1-hour daily maximum concentrations does not exceed 75 ppb.

The process for designating areas following promulgation of a new or revised NAAQS is contained in the CAA section 107(d) (42 U.S.C. 7407(d)). After promulgation of a new or revised NAAQS, each governor or tribal leader has an opportunity to recommend air quality designations, including the appropriate boundaries for Nonattainment areas, to the EPA. The EPA considers these recommendations as part of its duty to promulgate the formal area designations and boundaries for the new or revised NAAQS. By no later than 120 days prior to promulgating designations, the EPA is required to notify states, territories, and tribes, as appropriate, of any intended modifications to an area designation or boundary recommendation that the EPA deems necessary.

After invoking a 1-year extension of the deadlines to designate areas, as provided for in section 107 of the Act, the EPA completed an initial round of SO₂ designations for certain areas of the country on July 25, 2013 (referred to as “Round 1”).^[1] Following the initial designations, three lawsuits were filed against the EPA in different U.S. District Courts, alleging the agency had failed to perform a nondiscretionary duty under the CAA by not designating all portions of the country by the June 2, 2013, deadline. In one of those cases, the U.S. District Court for the Northern District of California on March 2, 2015, entered an enforceable order for the EPA to complete the area designations by three specific deadlines according to the court-ordered schedule.

To meet the first court-ordered deadline, additional areas were designated on June 30, 2016, and November 29, 2016 (collectively referred to as “Round 2”).^[2] Pursuant to the court-ordered schedule,^[3] the EPA must complete SO₂ designations for the remaining areas of the country by two specific deadlines: December 31, 2017, and December 31, 2020. This current third round of designations addresses all remaining undesignated areas except those where a state has installed and begun timely operating a new SO₂ monitoring network meeting EPA specifications referenced in EPA's SO₂ Data Requirements Rule.^[4]

On or about August 22, 2017, consistent with section 107(d)(1)(b)(ii) of the CAA, the EPA notified affected states, territories, and tribes of its intended designation of certain specific areas as either Nonattainment, Attainment/Unclassifiable, or Unclassifiable for the SO₂ NAAQS. These states then had the opportunity to demonstrate why they believed an intended modification of their updated recommendations by the EPA may be inappropriate. Although not required under the CAA, as the EPA had done for the first and second rounds of SO₂ designations, the EPA also chose to provide an opportunity for members of the public to comment on the EPA's August 2017 letters. The EPA published a notice of availability and public comment period for the intended designations on September 5, 2017 (82 FR 41903). The public comment period closed on October 5, 2017. The recommendations, the EPA's August 2017 letters, and the subsequent state and public comment letters, are in the docket for this third round of SO₂ designations at Docket ID No. EPA-HQ-OAR-2017-0003 and are available on the SO₂ designations website.

III. What is the 2010 SO2 NAAQS and what are the health concerns that it addresses?

The EPA revised the primary SO₂ NAAQS in a final rule published in the Federal Register on June 22, 2010 (75 FR 35520), which became effective on August 23, 2010. Based on review of the air quality criteria for oxides of sulfur and the primary NAAQS for oxides of sulfur as measured by SO_2, the EPA revised the primary SO₂ NAAQS to provide requisite protection of public health with an adequate margin of safety. Specifically, the EPA established a new 1-hour SO₂ standard at a level of 75 ppb, which is met at an ambient air quality monitoring site when the 3-year average of the annual 99th percentile of 1-hour daily maximum concentrations is less than or equal to 75 ppb, as determined in accordance with Appendix T of 40 CFR part 50. 40 CFR 50.17(a) and (b). The EPA also established provisions to revoke both the existing 24-hour and annual primary SO₂ standards, subject to certain conditions. 40 CFR 50.4(e).

Current scientific evidence links short-term exposures to SO₂, ranging from 5 minutes to 24 hours, with an array of adverse respiratory effects including bronchoconstriction and increased asthma symptoms. These effects are particularly important for asthmatics at elevated ventilation rates (e.g., while exercising or playing). Studies also show a connection between short-term exposure and increased visits to emergency departments and hospital admissions for respiratory illnesses, particularly in at-risk populations including children, the elderly and asthmatics.

IV. What are the CAA requirements for air quality designations and what action has the EPA taken to meet these requirements?

After the EPA promulgates a new or revised NAAQS, the EPA is required to designate all areas of the country as either “Nonattainment,” “Attainment,” or “Unclassifiable,” for that NAAQS pursuant to section 107(d)(1) of the CAA. As part of these Round 3 designations, the EPA is implementing its interpretation of statutory terms under CAA section 107(d) nationwide and is basing these designations on the EPA's nationwide analytical approach and technical analysis, including evaluation of monitoring data and air quality modeling, applied to the available evidence for each area.

Regarding statutory definitions and the EPA's interpretations of such, section 107(d)(1)(A)(i) of the CAA defines a Nonattainment area as an area that does not meet the NAAQS or that contributes to a nearby area that does not meet the NAAQS. An Attainment area is defined by the CAA as any area that meets the NAAQS and does not contribute to a nearby area that does not meet the NAAQS. Unclassifiable areas are defined by the CAA as those that cannot be classified on the basis of available information as meeting or not meeting the NAAQS.

For the purpose of this action for the 2010 SO₂ NAAQS, the EPA has interpreted and applied the statutory definitions as follows. The EPA defines a Nonattainment area as an area that the EPA has determined violates the 2010 SO₂ NAAQS or contributes to a violation in a nearby area, based on the most recent 3 years of air quality monitoring data, appropriate dispersion modeling analysis, and any other relevant information.

In this action, an Attainment/Unclassifiable area is defined by the EPA as an area that either: (1) Was not required to be characterized under 40 CFR 51.1203(c) or (d) for which available information does not indicate that the area violates the NAAQS or contributes to ambient air quality in a nearby area that does not meet the NAAQS; or (2) was required to be characterized under 40 CFR 51.1203(c) or (d) for which the EPA has determined the available information indicates the area meets the NAAQS and does not indicate the area contributes to ambient air quality in a nearby area that does not meet the NAAQS.

In this action, an Unclassifiable area is defined by the EPA as an area for which the available information does not allow the EPA to determine whether the area meets the definition of a Nonattainment area or the definition of an Attainment/Unclassifiable area.

This nationwide analytical approach also includes but is not limited to: (1) EPA's interpretations of other terms in the context of Round 3 of the 2010 SO₂ NAAQS; (2) the appropriate basis for characterizing the air quality of an area; (3) the five-factor analysis to determine the boundaries for each air quality area under the NAAQS; and (4) the methodology for appropriately characterizing SO₂ air quality through monitoring or modeling.

The EPA notes that CAA section 107(d) provides the agency with discretion to determine how best to interpret the terms in the definition of a Nonattainment area (e.g., “contributes to” and “nearby”) for a new or revised NAAQS, given considerations such as the nature of a specific pollutant, the types of sources that may contribute to violations, the form of the standards for the pollutant, and other relevant information. In particular, the EPA's position is that the statute does not require the agency to establish bright line tests or thresholds for what constitutes “contribution” or “nearby” for purposes of designations.^[5]

Similarly, the EPA's position is that the statute permits the EPA to evaluate the appropriate application of the term “area” to include geographic areas based upon full or partial county boundaries, as may be appropriate for a particular NAAQS. For example, CAA section 107(d)(1)(B)(ii) explicitly provides that the EPA can make modifications to designation recommendations for an area “or portions thereof,” and under CAA section 107(d)(1)(B)(iv) a designation remains in effect for an area “or portion thereof” until the EPA redesignates it.

By no later than 1 year after the promulgation of a new or revised NAAQS, CAA section 107(d)(1)(A) provides that each state governor is required to recommend air quality designations, including the appropriate boundaries for areas, to the EPA.^[6] The EPA reviews those recommendations and is authorized to make any modifications the Administrator deems necessary. The statute does not define the term “necessary,” but the EPA interprets this to authorize the Administrator to modify designations that did not meet the statutory requirements or were otherwise inconsistent with the facts or analysis deemed appropriate by the Administrator. If the EPA is considering modifications to a recommendation, we are required by CAA section 107(d)(1)(B)(ii) to notify the state of any such intended modifications not less than 120 days prior to our promulgation of the final designation. These notifications are commonly known as the “120-day letters.” During this period, if the state or territory does not agree with the EPA's proposed modification, it has an opportunity to respond to the EPA and to demonstrate why it believes the modification proposed by the EPA is inappropriate. If a state or territory fails to provide any recommendation for an area, in whole or in part, the EPA still must promulgate a designation that the Administrator deems appropriate, pursuant to CAA section 107(d)(1)(B)(ii). While CAA section 107(d) specifically addresses the designations process between the EPA and states and territories, the EPA followed the same process to the extent practicable for tribes that submitted designation recommendations.

V. What guidance did the EPA issue and how did the EPA apply the statutory requirements and applicable guidance to determine area designations and boundaries?

In the notice of proposed rulemaking for the revised SO₂ NAAQS (74 FR 64810; December 8, 2009), the EPA issued proposed guidance on our approach to implementing the standard, including our approach to initial area designations. The EPA solicited comment on that guidance and, in the notice of final rulemaking (75 FR 35520; June 22, 2010), provided further guidance concerning implementation of the standard and how to identify Nonattainment areas and boundaries for the SO₂ NAAQS. Subsequently, on March 24, 2011, the EPA provided additional designations guidance to assist states with making their recommendations for area designations and boundaries.^[7] That guidance recommended, among other things, that monitoring data from the most recent 3 consecutive years be used to identify a violation of the SO₂ NAAQS. This is appropriate because the form of the SO₂ NAAQS is calculated as a 3-year average of the 99th percentile of the yearly distribution of 1-hour daily maximum SO₂ concentrations (specifically the most recent 3 consecutive years). The EPA based the first round of final SO₂ designations in 2013 solely on violating monitored SO₂ concentrations for the years 2010-2012 from Federal Reference Method and Federal Equivalent Method monitors that are sited and operated in accordance with 40 CFR parts 50 and 58, and did not at that time designate any other areas.

In the March 24, 2011, guidance, the EPA stated that the perimeter of a county containing a violation would be the initial presumptive boundary for Nonattainment areas, but also stated that the state, tribe and/or the EPA could conduct additional area-specific analyses that could justify establishing either a larger or smaller area. The EPA indicated that the following factors should be considered in an analysis of whether to exclude portions of a county and whether to include additional nearby areas outside the county as part of the designated Nonattainment area: (1) Air quality data; (2) emissions-related data; (3) meteorology; (4) geography/topography; and (5) jurisdictional boundaries, as well as other available data. States and tribes may identify and evaluate other relevant factors or circumstances specific to a particular area.

Following entry of the March 2, 2015, court order setting forth the schedule for the EPA to complete SO₂ designations, the EPA issued updated designations guidance.^[8] This guidance superseded the March 24, 2011, designation guidance for the 2010 SO₂ NAAQS, and identified factors that the EPA intended to evaluate in determining whether areas are in violation of the 2010 SO₂ NAAQS or contribute to air quality in nearby areas that are in violation of the 2010 SO₂ NAAQS. The guidance also contained the factors the EPA intended to evaluate in determining the boundaries for all remaining areas in the country, consistent with the court's order and schedule. These factors include: (1) Air quality characterization via ambient monitoring or dispersion modeling results; (2) emissions-related data; (3) meteorology; (4) geography and topography; and (5) jurisdictional boundaries.^[9]

On March 8, 2017, the EPA issued a memo to clarify what version of the AERMOD modeling system is the most appropriate for consideration by the agency in the SO₂ designations process.^[10]

VI. What air quality information has the EPA used for these designations?

For designations for the SO₂ NAAQS, air agencies have the flexibility to characterize air quality using either appropriately sited ambient air quality monitors or modeling of actual or current allowable source emissions. These designations are based on the EPA's application of the nationwide analytical approach to, and technical assessment of, the weight of evidence for each area, including but not limited to available air quality monitoring data and air quality modeling results. The 1-hour primary SO₂ standard is violated at an ambient air quality monitoring site (or in the case of dispersion modeling, at an ambient air quality receptor location) when the 3-year average of the annual 99th percentile of the daily maximum 1-hour average concentrations exceeds 75 ppb, as determined in accordance with Appendix T of 40 CFR part 50. With respect to air quality monitoring data, the EPA has considered data from at least the most recent 3 calendar years, i.e., 2014-2016, as available. In most of the modeling runs available for EPA's review, the impacts of the actual emissions for one or more of the recent 3-year periods (e.g., 2012-2014, 2013-2015, 2014-2016) were considered, and in some cases the modeling was of currently effective limits on allowable emissions in lieu of or as a supplement to modeling of actual emissions.

The deadline for Round 3 designations and the practical difficulties of obtaining source emissions data for modeling, and complete, quality-assured, certified SO₂ monitoring data for the entirety of calendar year 2017 in December 2017, make the EPA's use of final 2017 emissions and monitoring data for this action generally impracticable. Under normal circumstances, the full year of such data would not be available to support regulatory determinations until after the end of the calendar year, and under the applicable regulations, the deadline for states to certify monitoring data is May 1, 2018. However, because these designations are being promulgated at the end of calendar year 2017, and because states can obtain source emissions information and make complete, quality-assured, certified 2017 data available for some areas quickly in 2018, in order to address the impracticability problem, the EPA is providing a process by which state-certified 2017 monitoring or emissions data that become available early in 2018 could be used in the designation process. We have provided that the final SO₂ designation decisions announced in this action will be effective on the date 90 days following the date of publication of this action in the Federal Register. If any state submits complete, quality-assured, certified 2017 data or related information about 2017 air quality to the EPA by February 28, 2018, supporting a change of the designation status for any area within that state, and the EPA agrees that a change of designation status is appropriate, then we will withdraw the designation announced in this action for such area and issue another designation that reflects the inclusion and analysis of such information. We emphasize that we will conduct this process only for those states that submit the information by the deadline of February 28, 2018, and in those instances where we can complete our analysis of the information and effect the change of designation status before the original effective date established by this final action.

If these submissions cause an area to change from Nonattainment to Attainment or Unclassifiable, the EPA will change the designation for the area following the process described in the preceding paragraph. If inclusion of 2017 data or related information about 2017 air quality indicates Nonattainment in an area that was designated Attainment or Unclassifiable, we will evaluate the reasons for the violation in the area and determine the appropriate course of action, which could include additional future action to change the designation for the area to Nonattainment.

VII. How do the Round 3 designations affect Indian country?

For areas of Indian country, there are no violating monitors. The Navajo Nation submitted modeling analyses for the areas around two SO₂ emission sources located in the Navajo Nation, the Navajo Generating Station and the Four Corners Power Plant, neither of which indicated a violation of the NAAQS. The Navajo Nation, the lands of the Hopi Tribe, and the Southern Ute Indian Reservation are being designated as separate areas. All other parts of Indian country are being designated as Attainment/Unclassifiable or Unclassifiable along with the surrounding state area. No areas of Indian country are being designated as Nonattainment in this round.

VIII. Where can I find information forming the basis for this rule and exchanges between the EPA, states and tribes related to this rule?

Information providing the basis for this final action are provided in a final technical support document (TSD) ¹¹ included in the docket. The final TSD, intended designations TSD, modeling files, technical assistance documents, applicable EPA guidance memoranda, public comments, and copies of correspondence regarding this process between the EPA and the states, territories, tribes, and other parties, are available for review at the public docket for these SO₂ designations at https://www.regulations.gov under Docket ID No. EPA-HQ-OAR-2017-0003, at the EPA Docket Center listed above in the ADDRESSES section of this document and on the agency's SO₂ Designations website at https://www.epa.gov/​sulfur-dioxide-designations. Area-specific questions can be addressed to the EPA Regional offices (see contact information provided at the beginning of this document).

IX. Environmental Justice Concerns

When the EPA establishes a new or revised NAAQS, the CAA requires the EPA to designate all areas of the U.S. as either Nonattainment, Attainment, or Unclassifiable. This action addresses designation determinations for certain areas for the 2010 SO₂ NAAQS. Area designations address environmental justice concerns by ensuring that the public is properly informed about the air quality in an area. In locations where air quality does not meet the NAAQS, the CAA requires relevant state authorities to initiate appropriate air quality management actions to ensure that all those residing, working, attending school, or otherwise present in those areas are protected, regardless of minority and economic status.

X. Statutory and Executive Order Reviews

A. Executive Order 12866: Regulatory Planning and Review and Executive Order 13563: Improving Regulation and Regulatory Review

This action is exempt from review by the Office of Management and Budget because it responds to the CAA requirement to promulgate air quality designations after promulgation of a new or revised NAAQS.

B. Executive Order 13771: Reducing Regulations and Controlling Regulatory Costs

This action is not an Executive Order 13771 regulatory action because actions such as air quality designations after promulgating a new revised NAAQS are exempt under Executive Order 12866.

C. Paperwork Reduction Act (PRA)

This action does not impose an information collection burden under the PRA. This action fulfills the non-discretionary duty for the EPA to promulgate air quality designations after promulgation of a new or revised NAAQS and does not contain any information collection activities.

D. Regulatory Flexibility Act (RFA)

This designation action under CAA section 107(d) is not subject to the RFA. The RFA applies only to rules subject to notice-and-comment rulemaking requirements under the APA, 5 U.S.C. 553, or any other statute. Section 107(d)(2)(B) of the CAA explicitly provides that designations are exempt from the notice-and-comment provisions of the APA. In addition, designations under CAA section 107(d) are not among the list of actions that are subject to the notice-and-comment rulemaking requirements of CAA section 307(d).

E. Unfunded Mandates Reform Act (UMRA)

This action does not contain any unfunded mandate as described in UMRA, 2 U.S.C. 1531-1538 and does not significantly or uniquely affect small governments. The action imposes no enforceable duty on any state, local, or tribal governments or the private sector.

F. Executive Order 13132: Federalism

This action does not have federalism implications. It will not have substantial direct effects on the states, on the relationship between the national government and the states, or on the distribution of power and responsibilities among the various levels of government. The division of responsibility between the federal government and the states for purposes of implementing the NAAQS is established under the CAA.

G. Executive Order 13175: Consultation and Coordination With Indian Tribal Government

This action does not have tribal implications, as specified in Executive Order 13175. This action concerns the designation of certain areas in the U.S. for the 2010 SO₂ NAAQS. The CAA provides for states, territories, and eligible tribes to develop plans to regulate emissions of air pollutants within their areas, as necessary, based on the designations. The Tribal Authority Rule (TAR) provides tribes the opportunity to apply for eligibility to develop and implement CAA programs, such as programs to attain and maintain the SO₂ NAAQS, but it leaves to the discretion of the tribe the decision of whether to apply to develop these programs and which programs, or appropriate elements of a program, the tribe will seek to adopt. This rule does not have a substantial direct effect on one or more Indian tribes. It would not create any additional requirements beyond those of the SO₂ NAAQS. This rule establishes the designations for certain areas of the country for the SO₂ NAAQS, but no areas of Indian country are being designated as Nonattainment by this action. Furthermore, this rule does not affect the relationship or distribution of power and responsibilities between the federal government and Indian tribes. The CAA and the TAR establish the relationship of the federal government and tribes in developing plans to attain the NAAQS, and this rule does nothing to modify that relationship. Thus, Executive Order 13175 does not apply.

Although Executive Order 13175 does not apply to this rule, after the EPA promulgated the 2010 primary SO₂ NAAQS, the EPA communicated with tribal leaders and environmental staff regarding the designations process. In 2011, the EPA also sent individualized letters to all federally recognized tribes to explain the designation process for the 2010 primary SO₂ NAAQS, to provide the EPA designations guidance, and to offer consultation with the EPA. The EPA provided further information to tribes through presentations at the National Tribal Forum and through participation in National Tribal Air Association conference calls. The EPA also sent individualized letters to all federally recognized tribes that submitted recommendations to the EPA about the EPA's intended Round 1 designations for the SO₂ standard and offered tribal leaders the opportunity for consultation.^[12] These communications provided opportunities for tribes to voice concerns to the EPA about the general designations process for the 2010 SO₂ NAAQS, as well as concerns specific to a tribe, and informed the EPA about key tribal concerns regarding designations as the designations process was under development and through its implementation up to that point. For the second round of SO₂ designations, the EPA sent additional letters to tribes that could potentially be affected and offered additional opportunities for participation in the designations process. For this third round of SO₂ designations, the EPA has sent similar letters to affected tribes.

H. Executive Order 13045: Protection of Children From Environmental Health and Safety Risks

The EPA interprets Executive Order 13045 as applying to those regulatory actions that concern environmental health or safety risks that the EPA has reason to believe may disproportionately affect children, per the definition of “covered regulatory action” in section 2-202 of the Executive Order. This action is not subject to Executive Order 13045 because it does not establish an environmental standard intended to mitigate health or safety risks.

I. Executive Order 13211: Actions That Significantly Affect Energy Supply, Distribution or Use

This action is not subject to Executive Order 13211 because it is not a significant regulatory action under Executive Order 12866.

J. National Technology Transfer and Advancement Act (NTTAA)

This rulemaking does not involve technical standards.

K. Executive Order 12898: Federal Actions To Address Environmental Justice in Minority Populations and Low-Income Populations

The EPA believes that this action does not have disproportionately high and adverse human health or environmental effects on minority populations, low-income populations and/or indigenous peoples, as specified in Executive Order 12898 (59 FR 7629, February 16, 1994). The documentation for this determination is contained in Section IX of this preamble, “Environmental Justice Concerns.”

L. Congressional Review Act (CRA)

This action is subject to the CRA, and the EPA will submit a rule report to each House of the Congress and to the Comptroller General of the U.S. This action is not a “major rule” as defined by 5 U.S.C. 804(2).

M. Judicial Review

Section 307(b)(1) of the CAA indicates which Federal Courts of Appeal have venue for petitions of review of final actions by the EPA. This section provides, in part, that petitions for review must be filed in the Court of Appeals for the District of Columbia Circuit: (i) When the agency action consists of “nationally applicable regulations promulgated, or final actions taken, by the Administrator,” or (ii) when such action is locally or regionally applicable, if “such action is based on a determination of nationwide scope or effect and if in taking such action the Administrator finds and publishes that such action is based on such a determination.”

This final action to designate certain areas for the 2010 SO₂ NAAQS is “nationally applicable” within the meaning of section 307(b)(1). The final action establishes designations for areas across the U.S. for the 2010 SO₂ NAAQS. At the core of this action is the EPA's nationwide analytical approach and technical analysis, including evaluation of monitoring data and air quality modeling, applied to the available evidence for each area, including the EPA's interpretation of statutory terms in the CAA such as the definitions of Nonattainment, Attainment, and Unclassifiable under section 107(d)(1) of the CAA, and its application of that interpretation to areas across the country. Accordingly, the Administrator has determined that the final action is nationally applicable and is hereby publishing that finding in the Federal Register.

For the same reasons discussed above that make the final rule nationally applicable, the Administrator also has determined that the final designations are of nationwide scope and effect for the purposes of section 307(b)(1). This is particularly appropriate because, in the report on the 1977 Amendments that revised section 307(b)(1) of the CAA, Congress noted that the Administrator's determination that an action is of “nationwide scope or effect” would be appropriate for any action that has a scope or effect beyond a single judicial circuit. H.R. Rep. No. 95-294 at 323, 324, reprinted in 1977 U.S.C.C.A.N. 1402-03. Here, the scope and effect of the action will extend to numerous judicial circuits since the designations will apply to areas across the country. In these circumstances, section 307(b)(1) and its legislative history calls for the Administrator to find the action to be of “nationwide scope or effect” and for venue to be in the D.C. Circuit. Therefore, the Administrator has determined that the final action is based on a determination by the Administrator of nationwide scope or effect, and is hereby publishing that finding in the Federal Register.

List of Subjects in 40 CFR Part 81

• Air pollution control
• National parks
• Wilderness areas

Dated: December 21, 2017.

E. Scott Pruitt,

Administrator.

For the reasons set forth in the preamble, 40 CFR part 81 is amended as follows:

PART 81—DESIGNATIONS OF AREAS FOR AIR QUALITY PLANNING PURPOSES

1. The authority citation for part 81 continues to read as follows:

Authority: 42 U.S.C. 7401, et seq.

Subpart C—Section 107 Attainment Status Designations

2. Section 81.301 is amended by adding a table titled “Alabama—2010 Sulfur Dioxide NAAQS (Primary)” following the table titled “Alabama—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.301

Alabama.

* * * * *

Alabama—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Escambia County		Unclassifiable.
Mobile County		Unclassifiable.
Morgan County		Unclassifiable.
Pike County		Unclassifiable.
Shelby County		Unclassifiable.
Shelby County (part) 3
2016 US Census Block Groups 011170308001 and 011170308002
Washington County		Unclassifiable.
Rest of State:
Autauga County		Attainment/Unclassifiable.
Baldwin County		Attainment/Unclassifiable.
Barbour County		Attainment/Unclassifiable.
Bibb County		Attainment/Unclassifiable.
Blount County		Attainment/Unclassifiable.
Bullock County		Attainment/Unclassifiable.
Butler County		Attainment/Unclassifiable.
Calhoun County		Attainment/Unclassifiable.
Chambers County		Attainment/Unclassifiable.
Cherokee County		Attainment/Unclassifiable.
Chilton County		Attainment/Unclassifiable.
Choctaw County		Attainment/Unclassifiable.
Clarke County		Attainment/Unclassifiable.
Clay County		Attainment/Unclassifiable.
Cleburne County		Attainment/Unclassifiable.
Coffee County		Attainment/Unclassifiable.
Colbert County		Attainment/Unclassifiable.
Conecuh County		Attainment/Unclassifiable.
Coosa County		Attainment/Unclassifiable.
Covington County		Attainment/Unclassifiable.
Crenshaw County		Attainment/Unclassifiable.
Cullman County		Attainment/Unclassifiable.
Dale County		Attainment/Unclassifiable.
Dallas County		Attainment/Unclassifiable.
DeKalb County		Attainment/Unclassifiable.
Elmore County		Attainment/Unclassifiable.
Etowah County		Attainment/Unclassifiable.
Fayette County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Geneva County		Attainment/Unclassifiable.
Greene County		Attainment/Unclassifiable.
Hale County		Attainment/Unclassifiable.
Henry County		Attainment/Unclassifiable.
Houston County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jefferson County		Attainment/Unclassifiable.
Lamar County		Attainment/Unclassifiable.
Lauderdale County		Attainment/Unclassifiable.
Lawrence County		Attainment/Unclassifiable.
Lee County		Attainment/Unclassifiable.
Limestone County		Attainment/Unclassifiable.
Lowndes County		Attainment/Unclassifiable.
Macon County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Marengo County		Attainment/Unclassifiable.
Marion County		Attainment/Unclassifiable.
Marshall County		Attainment/Unclassifiable.
Monroe County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Perry County		Attainment/Unclassifiable.
Pickens County		Attainment/Unclassifiable.
Randolph County		Attainment/Unclassifiable.
Russell County		Attainment/Unclassifiable.
St. Clair County		Attainment/Unclassifiable.
Sumter County		Attainment/Unclassifiable.
Talladega County		Attainment/Unclassifiable.
Tallapoosa County		Attainment/Unclassifiable.
Tuscaloosa County		Attainment/Unclassifiable.
Walker County		Attainment/Unclassifiable.
Wilcox County		Attainment/Unclassifiable.
Winston County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 The remainder of Shelby County will be designated by December 31, 2020.

* * * * *

3. Section 81.302 is amended by adding a table titled “Alaska—2010 Sulfur Dioxide NAAQS (Primary)” following the table titled “Alaska—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.302

Alaska.

* * * * *

Alaska—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Entire State		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

4. Section 81.303 is amended by revising the table entitled “Arizona—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.303

Arizona.

* * * * *

Arizona—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Hayden, AZ 3	10-4-13	Nonattainment.
Gila County (part)
The portions of Gila County that are bounded by: T4S, R14E; T4S, R15E; T4S, R16E; T5S, R15E; T5S, R16E
Pinal County (part)
The portions of Pinal County that are bounded by: T4S, R14E; T4S, R15E; T4S, R16E; T5S, R14E; T5S, R15E; T5S, R16E; T6S, R14E; T6S, R15E; T6S, R16E
Miami, AZ 3	10-4-13	Nonattainment.
Gila County (part)
The portions of Gila County that are bounded by: T2N, R14E; T2N, R15E; T1N, R13E; T1N, R14E; T1N, R15E; T1S, R14E; T1S, R14 1/2E; T1S, R15E
Coconino County (part)		Unclassifiable.
The portions of Coconino County located within the Navajo Nation areas of Indian country within a 50-km radius of the Navajo Generating Station at the coordinates 39.904006 decimal degrees latitude and −111.389435 decimal degrees longitude, using the 1984 World Geodetic Survey datum.
Rest of State:
Apache County (part) 4		Attainment/Unclassifiable.
Cochise County		Attainment/Unclassifiable.
Coconino County (part) 5		Attainment/Unclassifiable.
Gila County (part) 6		Attainment/Unclassifiable.
Graham County		Attainment/Unclassifiable.
Greenlee County		Attainment/Unclassifiable.
Lands of the Hopi Tribe		Attainment/Unclassifiable.
La Paz County		Attainment/Unclassifiable.
Maricopa County		Attainment/Unclassifiable.
Mohave County		Attainment/Unclassifiable.
Navajo County (part) 7		Attainment/Unclassifiable.
Lands of the Navajo Nation (part) 8		Attainment/Unclassifiable.
Pima County		Attainment/Unclassifiable.
Pinal County (part) 9		Attainment/Unclassifiable.
Santa Cruz County		Attainment/Unclassifiable.
Yavapai County		Attainment/Unclassifiable.
Yuma County		Attainment/Unclassifiable.
1 Includes Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Excludes Indian country located in each area, if any, unless otherwise specified.
4 Excludes lands of the White Mountain Apache Tribe.
5 Excludes lands of the Hopi Tribe and lands of the Navajo Nation.
6 Excludes the lands of the White Mountain Apache Tribe and the Hayden, AZ and Miami, AZ Nonattainment areas.
7 Includes all lands of the White Mountain Apache Tribe, including those lands of the White Mountain Apache Tribe geographically located in Apache County and Gila County, and excludes lands of the Hopi Tribe and lands of the Navajo Nation.
8 Includes all lands of the Navajo Nation except for the portions of the Navajo Nation lands designated Unclassifiable. Includes the lands of the Navajo Nation geographically located within the states of New Mexico and Utah.
9 Excludes the Hayden, AZ Nonattainment area.

* * * * *

5. Section 81.304 is amended by revising the table entitled “Arkansas—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.304

Arkansas.

* * * * *

Arkansas—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Independence County	9/12/16	Unclassifiable.
Arkansas County		Attainment/Unclassifiable.
Ashley County		Attainment/Unclassifiable.
Baxter County		Attainment/Unclassifiable.
Benton County		Attainment/Unclassifiable.
Boone County		Attainment/Unclassifiable.
Bradley County		Attainment/Unclassifiable.
Calhoun County		Attainment/Unclassifiable.
Carroll County		Attainment/Unclassifiable.
Chicot County		Attainment/Unclassifiable.
Clark County		Attainment/Unclassifiable.
Clay County		Attainment/Unclassifiable.
Cleburne County		Attainment/Unclassifiable.
Cleveland County		Attainment/Unclassifiable.
Columbia County		Attainment/Unclassifiable.
Conway County		Attainment/Unclassifiable.
Craighead County		Attainment/Unclassifiable.
Crawford County		Attainment/Unclassifiable.
Crittenden County		Attainment/Unclassifiable.
Cross County		Attainment/Unclassifiable.
Dallas County		Attainment/Unclassifiable.
Desha County		Attainment/Unclassifiable.
Drew County		Attainment/Unclassifiable.
Faulkner County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Fulton County		Attainment/Unclassifiable.
Garland County		Attainment/Unclassifiable.
Grant County		Attainment/Unclassifiable.
Greene County		Attainment/Unclassifiable.
Hempstead County		Attainment/Unclassifiable.
Hot Spring County		Attainment/Unclassifiable.
Howard County		Attainment/Unclassifiable.
Izard County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jefferson County	9/12/16	Attainment/Unclassifiable.
Johnson County		Attainment/Unclassifiable.
Lafayette County		Attainment/Unclassifiable.
Lawrence County		Attainment/Unclassifiable.
Lee County		Attainment/Unclassifiable.
Lincoln County		Attainment/Unclassifiable.
Little River County		Attainment/Unclassifiable.
Logan County		Attainment/Unclassifiable.
Lonoke County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Marion County		Attainment/Unclassifiable.
Miller County		Attainment/Unclassifiable.
Mississippi County		Attainment/Unclassifiable.
Monroe County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Nevada County		Attainment/Unclassifiable.
Newton County		Attainment/Unclassifiable.
Ouachita County		Attainment/Unclassifiable.
Perry County		Attainment/Unclassifiable.
Phillips County		Attainment/Unclassifiable.
Pike County		Attainment/Unclassifiable.
Poinsett County		Attainment/Unclassifiable.
Polk County		Attainment/Unclassifiable.
Pope County		Attainment/Unclassifiable.
Prairie County		Attainment/Unclassifiable.
Pulaski County		Attainment/Unclassifiable.
Randolph County		Attainment/Unclassifiable.
St. Francis County		Attainment/Unclassifiable.
Saline County		Attainment/Unclassifiable.
Scott County		Attainment/Unclassifiable.
Searcy County		Attainment/Unclassifiable.
Sebastian County		Attainment/Unclassifiable.
Sevier County		Attainment/Unclassifiable.
Sharp County		Attainment/Unclassifiable.
Stone County		Attainment/Unclassifiable.
Union County		Attainment/Unclassifiable.
Van Buren County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
White County		Attainment/Unclassifiable.
Woodruff County		Attainment/Unclassifiable.
Yell County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

6. Section 81.305 is amended by adding a table titled “California—2010 Sulfur Dioxide NAAQS (Primary)” following the table “California—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.305

California.

* * * * *

California—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Great Basin Valleys Air Basin		Attainment/Unclassifiable.
Alpine County
Inyo County
Mono County
Lake County Air Basin		Attainment/Unclassifiable.
Lake County
Lake Tahoe Air Basin		Attainment/Unclassifiable.
El Dorado County (part)
That portion of El Dorado County within the drainage area naturally tributary to Lake Tahoe including said Lake
Placer County (part)
That portion of Placer County within the drainage area naturally tributary to Lake Tahoe including said Lake, plus that area in the vicinity of the head of the Truckee River described as follows: Commencing at the point common to the aforementioned drainage area crestline and the line common to Townships 15 North and 16 North, M.D.B. & M., and following that line in a westerly direction to the northwest corner of Section 3, Township 15 North, Range 16 East, M.D.B. & M., thence south along the west line of Sections 3 and 10, Township 15 North, Range 16 East, M.D.B. & M., to the intersection with the said drainage area crestline, thence following the said drainage area boundary in a southeasterly direction, then northeasterly direction to and along the Lake Tahoe Dam, thence following the said drainage area crestline in a northeasterly, then northwesterly direction to the point of beginning
Mojave Desert Air Basin		Attainment/Unclassifiable.
Kern County (part)
That portion of Kern County east and south of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grantto the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grantto the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31 T. 28 S., R. 32E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Los Angeles County (part)
That portion of Los Angeles County which lies north and east of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to T. 3 N and T. 2 N, San Bernardino Base and Meridian; then north along the range line common to R. 8 W and R. 9 W; then west along the township line common to T. 4 N and T. 3 N; then north along the range line common to R. 12 W and R. 13 W to the southeast corner of Section 12, T. 5 N, R. 13 W; then west along the south boundaries of Sections 12, 11, 10, 9, 8, 7, T. 5 N, R. 13 W to the boundary of the Angeles National Forest which is collinear with the range line common to R. 13 W and R. 14 W; then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to T. 7 N and T. 6 N (point is at the northwest corner of Section 4 in T. 6 N, R. 14 W); then west along the township line common to T. 7 N and T. 6 N; then north along the range line common to R. 15 W and R. 16 W to the southeast corner of Section 13, T. 7 N, R. 16 W; then along the south boundaries of Sections 13, 14, 15, 16, 17, 18, T. 7 N, R. 16 W; then north along the range line common to R. 16 W and R. 17 W to the north boundary of the Angeles National Forest (collinear with township line common to T. 8 N and T. 7 N) then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Riverside County (part)
That portion of Riverside County which lies east of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to R. 17 E. and R. 16 E., San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through T. 8 S., R. 16 E. and T. 7 S., R. 16 E., until the Black Butte Mountain, elev. 4504′; then west and northwest along the ridge line to the southwest corner of T. 5 S., R. 14 E.; then north along the range line common to R. 14 E. and R. 13 E.; then west and northwest along the ridge line to Monument Mountain, elev. 4834′; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814′; then northwest along the ridge line to the Riverside-San Bernardino County line
San Bernardino County (part)
That portion of San Bernardino County east and north of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to R. 3 E and R. 2 E, San Bernardino Base and Meridian; then west along the township line common to T. 3 N and T. 2 N to the San Bernardino-Los Angeles County boundary
Mountain Counties Air Basin		Attainment/Unclassifiable.
Amador County
Calaveras County
El Dorado County (part)
All of El Dorado County except that portion included in the Lake Tahoe Air Basin
Mariposa County
Nevada County
Placer County (part)
All of Placer County except that portion included in the Lake Tahoe Air Basin and that portion included in the Sacramento Valley Air Basin
Plumas County
Sierra County
Tuolumne County
North Central Air Basin		Attainment/Unclassifiable.
Monterey County
San Benito County
Santa Cruz County
North Coast Air Basin		Attainment/Unclassifiable.
Del Norte County
Humboldt County
Mendocino County
Sonoma County (part)
That portion of Sonoma County which lies north and west of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California
Trinity County
Northeast Plateau Air Basin		Attainment/Unclassifiable.
Lassen County
Modoc County
Siskiyou County
Sacramento Valley Air Basin		Attainment/Unclassifiable.
Butte County
Colusa County
Glenn County
Placer County (part)
That portion of Placer County which lies west of Range 9 east, M.D.B. & M
Sacramento County
Shasta County
Solano County (part)
That portion of Solano County which lies north and east of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1/4 section line to the east boundary of Section 36, T6N, R2W, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties
Sutter County
Tehama County
Yolo County
Yuba County
Salton Sea Air Basin		Attainment/Unclassifiable.
Imperial County
Riverside County (part)
That portion of Riverside County which lies east of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to R. 4 E and R. 3 E; then east along the township line common to T. 8 S and T. 7 S; then north along the range line common to R. 5 E and R. 4 E; then west along the township line common to T. 6 S and T. 7 S to the southwest corner of Section 34, T. 6 S, R. 4 E; then north along the west boundaries of Sections 34, 27, 22, 15, 10, 3, T. 6 S, R. 4 E; then west along the township line common to T. 5 S and T. 6 S; then north along the range line common to R. 4 E and R. 3 E; then west along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, T. 5 S. R. 3 E; then north along the range line common to R. 2 E and R. 3 E to the Riverside-San Bernardino County line; and west of a line described as follows: That segment of the southwestern boundary line of Hydrologic Unit Number 18100100 within Riverside County, further described as follows: Beginning at the Riverside-Imperial County boundary and running north along the range line common to R. 17 E. and R. 16 E., San Bernardino Base and Meridian; then northwest along the ridge line of the Chuckwalla Mountains, through T. 8 S., R. 16 E. and T. 7 S., R. 16 E., until the Black Butte Mountain, elev. 4504′; then west and northwest along the ridge line to the southwest corner of T. 5 S., R. 14 E.; then north along the range line common to R. 14 E. and R. 13 E.; then west and northwest along the ridge line to Monument Mountain, elev. 4834′; then southwest and then northwest along the ridge line of the Little San Bernardino Mountains to Quail Mountain, elev. 5814′; then northwest along the ridge line to the Riverside-San Bernardino County line
San Diego Air Basin		Attainment/Unclassifiable.
San Diego County
San Francisco Bay Area Air Basin		Attainment/Unclassifiable.
Alameda County
Contra Costa County
Marin County
Napa County
San Francisco County
San Mateo County
Santa Clara County
Solano County (part)
That portion of Solano County which lies south and west of a line described as follows: Beginning at the intersection of the westerly boundary of Solano County and the 1/4 section line running east and west through the center of Section 34, T6N, R2W, M.D.B. & M., thence east along said 1/4 section line to the east boundary of Section 36, T6N, R2W, thence south 1/2 mile and east 2.0 miles, more or less, along the west and south boundary of Los Putos Rancho to the northwest corner of Section 4, T5N, R1W, thence east along a line common to T5N and T6N to the northeast corner of Section 3, T5N, R1E, thence south along section lines to the southeast corner of Section 10, T3N, R1E, thence east along section lines to the south 1/4 corner of Section 8, T3N, R2E, thence east to the boundary between Solano and Sacramento Counties
Sonoma County (part)
That portion of Sonoma County which lies south and east of a line described as follows: Beginning at the southeasterly corner of the Rancho Estero Americano, being on the boundary line between Marin and Sonoma Counties, California; thence running northerly along the easterly boundary line of said Rancho Estero Americano to the northeasterly corner thereof, being an angle corner in the westerly boundary line of Rancho Canada de Jonive; thence running along said boundary of Rancho Canada de Jonive westerly, northerly and easterly to its intersection with the easterly line of Graton Road; thence running along the easterly and southerly line of Graton Road, northerly and easterly to its intersection with the easterly line of Sullivan Road; thence running northerly along said easterly line of Sullivan Road to the southerly line of Green Valley Road; thence running easterly along the said southerly line of Green Valley Road and easterly along the southerly line of State Highway 116, to the westerly line of Vine Hill Road; thence running along the westerly and northerly line of Vine Hill Road, northerly and easterly to its intersection with the westerly line of Laguna Road; thence running northerly along the westerly line of Laguna Road and the northerly projection thereof to the northerly line of Trenton Road; thence running westerly along the northerly line of said Trenton Road to the easterly line of Trenton-Healdsburg Road; thence running northerly along said easterly line of Trenton-Healdsburg Road to the easterly line of Eastside Road; thence running northerly along said easterly line of Eastside Road to its intersection with the southerly line of Rancho Sotoyome; thence running easterly along said southerly line of Rancho Sotoyome to its intersection with the Township line common to Townships 8 and 9 North, M.D.M.; thence running easterly along said township line to its intersection with the boundary line between Sonoma and Napa Counties, State of California
San Joaquin Valley Air Basin		Attainment/Unclassifiable.
Fresno County
Kern County (part)
That portion of Kern County which lies west and north of a line described as follows: Beginning at the Kern-Los Angeles County boundary and running north and east along the northwest boundary of the Rancho La Libre Land Grant to the point of intersection with the range line common to R. 16 W. and R. 17 W., San Bernardino Base and Meridian; north along the range line to the point of intersection with the Rancho El Tejon Land Grant boundary; then southeast, northeast, and northwest along the boundary of the Rancho El Tejon Land Grant to the northwest corner of S. 3, T. 11 N., R. 17 W.; then west 1.2 miles; then north to the Rancho El Tejon Land Grant boundary; then northwest along the Rancho El Tejon line to the southeast corner of S. 34, T. 32 S., R. 30 E., Mount Diablo Base and Meridian; then north to the northwest corner of S. 35, T. 31 S., R. 30 E.; then northeast along the boundary of the Rancho El Tejon Land Grant to the southwest corner of S. 18, T. 31 S., R. 31 E.; then east to the southeast corner of S. 13, T. 31 S., R. 31 E.; then north along the range line common to R. 31 E. and R. 32 E., Mount Diablo Base and Meridian, to the northwest corner of S. 6, T. 29 S., R. 32 E.; then east to the southwest corner of S. 31, T. 28 S., R. 32 E.; then north along the range line common to R. 31 E. and R. 32 E. to the northwest corner of S. 6, T. 28 S., R. 32 E., then west to the southeast corner of S. 36, T. 27 S., R. 31 E., then north along the range line common to R. 31 E. and R. 32 E. to the Kern-Tulare County boundary
Kings County
Madera County
Merced County
San Joaquin County
Stanislaus County
Tulare County
South Central Air Basin		Attainment/Unclassifiable.
San Luis Obispo County
Santa Barbara County
Ventura County
South Coast Air Basin		Attainment/Unclassifiable.
Los Angeles County (part)
That portion of Los Angeles County which lies south and west of a line described as follows: Beginning at the Los Angeles-San Bernardino County boundary and running west along the township line common to T.3 N and T.2 N, San Bernardino Base and Meridian; then north along the range line common to R.8 W and R.9 W; then west along the township line common to T.4 N and T.3 N; then north along the range line common to R.12 W and R.13 W to the southeast corner of Section 12, T.5 N, R. 13 W; then west along the south boundaries of Sections 12, 11, 10, 9, 8, 7, T.5 N, R. 13 W to the boundary of the Angeles National Forest which is collinear with the range line common to R. 13 W and R. 14 W; then north and west along the Angeles National Forest boundary to the point of intersection with the township line common to T.7 N and T. 6 N (point is at the northwest corner of Section 4 in T.6 N, R. 14 W); then west along the township line common to T.7 N and T.6 N; then north along the range line common to R. 15 W and R. 16 W to the southeast corner of Section 13, T.7 N, R. 16 W; then along the south boundaries of Sections 13, 14, 15, 16, 17, 18, T.7 N, R. 16 W; then north along the range line common to R.16 W and R. 17 W to the north boundary of the Angeles National Forest (collinear with township line common to T.8 N and T.7 N); then west and north along the Angeles National Forest boundary to the point of intersection with the south boundary of the Rancho La Liebre Land Grant; then west and north along this land grant boundary to the Los Angeles-Kern County boundary
Orange County
Riverside County (part)
That portion of Riverside County which lies west of a line described as follows: Beginning at the Riverside-San Diego County boundary and running north along the range line common to R. 4 E and R. 3 E; then east along the township line common to T. 8 S and T. 7 S; then north along the range line common to R. 5 E and R. 4 E; then west along the township line common to T. 6 S and T. 7 S to the southwest corner of Section 34, T. 6 S, R. 4 E; then north along the west boundaries of Sections 34, 27, 22, 15, 10, 3, T. 6 S, R. 4 E; then west along the township line common to T. 5 S and T. 6 S; then north along the range line common to R. 4 E and R. 3 E; then west along the south boundaries of Sections 13, 14, 15, 16, 17 and 18, T. 5 S. R. 3 E; then north along the range line common to R. 2 E and R. 3 E to the Riverside-San Bernardino County line
San Bernardino County (part)
That portion of San Bernardino County west and south of a line described as follows: Beginning at the San Bernardino-Riverside County boundary and running north along the range line common to R. 3 E and R. 2 E; then west along the township line common to T. 3 N and T. 2 N to the San Bernardino-Los Angeles County boundary
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

7. Section 81.306 is amended by revising the table entitled “Colorado—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.306

Colorado.

* * * * *

Colorado—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 3	Type
Colorado Springs, CO	9/12/16	Unclassifiable.
El Paso County (part)
Manitou Springs
Colorado Springs (and certain unincorporated areas) as follows; Areas east of the western city limits of Colorado Springs, north of the southern city limits of Colorado Springs with the addition of the area termed “Stratmoor” bounded on the south by South Academy Boulevard, west of Powers Blvd, and south of East Woodman Blvd (east of Academy Blvd. N) and the northern city limits of Colorado Springs (west of Academy Blvd. N).
Eastern Morgan County, CO	9/12/16	Unclassifiable.
Morgan County (part)
Circle with a 12-kilometer radius centered on the Pawnee Power Plant
State AQCR 01 (remainder)		Attainment/Unclassifiable.
Logan County
Morgan County (part) (remainder)
Phillips County
Sedgwick County
Washington County
Yuma County
State AQCR 02		Attainment/Unclassifiable.
Larimer County
Weld County
State AQCR 03		Attainment/Unclassifiable.
Adams County
Arapahoe County
Boulder County
Broomfield County
Clear Creek County
Denver County
Douglas County
Gilpin County
Jefferson County
State AQCR 04 (remainder)		Attainment/Unclassifiable.
El Paso County (part) (remainder)
Park County
Teller County
State AQCR 05		Attainment/Unclassifiable.
Cheyenne County
Elbert County
Kit Carson County
Lincoln County
State AQCR 06		Attainment/Unclassifiable.
Baca County
Bent County
Crowley County
Kiowa County
Otero County
Prowers County
State AQCR 07		Attainment/Unclassifiable.
Huerfano
Las Animas
Pueblo
State AQCR 08		Attainment/Unclassifiable.
Alamosa County
Conejos County
Costilla County
Mineral County
Rio Grande County
Saguache County
State AQCR 09		Attainment/Unclassifiable.
Archuleta County 2
Dolores
La Plata 2
Montezuma 2
San Juan
State AQCR 10		Attainment/Unclassifiable.
Delta County
Gunnison County
Hinsdale County
Montrose County
Ouray County
San Miguel County
State AQCR 11		Attainment/Unclassifiable.
Garfield County
Mesa County
Moffat County
Rio Blanco County
State AQCR 12		Attainment/Unclassifiable.
Eagle County
Grand County
Jackson County
Pitkin County
Routt County
Summit County
State AQCR 13		Attainment/Unclassifiable.
Chaffee County
Custer County
Fremont County
Lake County
Southern Ute Indian Reservation		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 Does not include the Southern Ute Indian Reservation, which is being designated separately.
3 This date is April 9, 2018, unless otherwise noted.

* * * * *

8. Section 81.307 is amended by adding a table entitled “Connecticut—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Connecticut—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.307

Connecticut.

* * * * *

Connecticut—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
State of Connecticut		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

9. Section 81.308 is amended by adding a new table entitled “Delaware—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Delaware—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.308

Delaware.

* * * * *

Delaware—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Entire State		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

10. Section 81.309 is amended by adding a table titled “District of Columbia—2010 Sulfur Dioxide NAAQS (Primary)” following the table titled “District of Columbia—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.309

District of Columbia.

* * * * *

District of Columbia—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
District of Columbia		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

11. Section 81.310 is amended by revising the table entitled “Florida—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.310

Florida.

* * * * *

Florida—2010 Sulfur Dioxide NAAQS (Primary)

Designated area	Designation
	Date 1	Type
Hillsborough County, FL 2	10/4/13	Nonattainment.
Hillsborough County (part)
That portion of Hillsborough County encompassed by the polygon with the vertices using Universal Traverse Mercator (UTM) coordinates in UTM zone 17 with datum NAD83 as follows: (1) Vertices-UTM Easting (m) 358581, UTM Northing 3076066; (2) vertices-UTM Easting (m) 355673, UTM Northing 3079275; (3) UTM Easting (m) 360300, UTM Northing 3086380; (4) vertices-UTM Easting (m) 366850, UTM Northing 3086692; (5) vertices-UTM Easting (m) 368364, UTM Northing 3083760; and (6) vertices-UTM Easting (m) 365708, UTM Northing 3079121
Hillsborough—Polk County, FL 3		Nonattainment.
Hillsborough County (part)
Polk County (part)
That portion of Hillsborough and Polk Counties encompassed by the polygon with the vertices using Universal Traverse Mercator (UTM) coordinates in UTM zone 17 with datum NAD83 as follows: 390,500 E, 3,073,500 N; 390,500 E, 3,083,500 N; 400,500 E, 3,083,500 N; 400,500 E, 3,073,500 N
Nassau County, FL 2	10/4/13	Nonattainment.
Nassau County (part)
That portion of Nassau County encompassing the circular boundary with the center being UTM Easting 455530 meters, UTM Northing 3391737 meters, UTM zone 17, using the NAD83 datum (the location of the violating ambient monitor) and the radius being 2.4 kilometers
Citrus County, FL 3		Unclassifiable.
Citrus County (part)
Census Block Groups 4504004 and 4505002
Mulberry, FL Area 3		Unclassifiable.
Hillsborough County (part)
Polk County (part)
That portion of Hillsborough and Polk Counties encompassed by the polygon with the vertices using Universal Traverse Mercator (UTM) coordinates in UTM zone 17 with datum NAD83 starting with the Northwest Corner and proceeding to the Northeast as follows: 390,500 E, 3,083,500 N; 410,700 E, 3,091,600 N; 412,900 E, 3,089,800 N; 412,900 E, 3,084,600 N; 400,500 E, 3,073,500 N; 400,500 E, 3,083,500 N
Rest of State: 3
Alachua County		Attainment/Unclassifiable.
Baker County		Attainment/Unclassifiable.
Bay County		Attainment/Unclassifiable.
Bradford County		Attainment/Unclassifiable.
Brevard County		Attainment/Unclassifiable.
Broward County		Attainment/Unclassifiable.
Calhoun County		Attainment/Unclassifiable.
Charlotte County		Attainment/Unclassifiable.
Citrus County (part) (remainder)		Attainment/Unclassifiable.
Clay County		Attainment/Unclassifiable.
Collier County		Attainment/Unclassifiable.
Columbia County		Attainment/Unclassifiable.
DeSoto County		Attainment/Unclassifiable.
Dixie County		Attainment/Unclassifiable.
Duval County		Attainment/Unclassifiable.
Escambia County		Attainment/Unclassifiable.
Flagler County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Gadsden County		Attainment/Unclassifiable.
Gilchrist County		Attainment/Unclassifiable.
Glades County		Attainment/Unclassifiable.
Gulf County		Attainment/Unclassifiable.
Hamilton County		Attainment/Unclassifiable.
Hardee County		Attainment/Unclassifiable.
Hendry County		Attainment/Unclassifiable.
Hernando County		Attainment/Unclassifiable.
Highlands County		Attainment/Unclassifiable.
Hillsborough County (part) (remainder)		Attainment/Unclassifiable.
Holmes County		Attainment/Unclassifiable.
Indian River County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jefferson County		Attainment/Unclassifiable.
Lafayette County		Attainment/Unclassifiable.
Lake County		Attainment/Unclassifiable.
Lee County		Attainment/Unclassifiable.
Leon County		Attainment/Unclassifiable.
Levy County		Attainment/Unclassifiable.
Liberty County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Manatee County		Attainment/Unclassifiable.
Marion County		Attainment/Unclassifiable.
Martin County		Attainment/Unclassifiable.
Miami-Dade County		Attainment/Unclassifiable.
Monroe County		Attainment/Unclassifiable.
Nassau County (part) (remainder)		Attainment/Unclassifiable.
Okaloosa County		Attainment/Unclassifiable.
Okeechobee County		Attainment/Unclassifiable.
Orange County		Attainment/Unclassifiable.
Osceola County		Attainment/Unclassifiable.
Palm Beach County		Attainment/Unclassifiable.
Pasco County		Attainment/Unclassifiable.
Pinellas County		Attainment/Unclassifiable.
Polk County (part) (remainder)		Attainment/Unclassifiable.
Putnam County		Attainment/Unclassifiable.
St. Johns County		Attainment/Unclassifiable.
St. Lucie County		Attainment/Unclassifiable.
Santa Rosa County		Attainment/Unclassifiable.
Sarasota County		Attainment/Unclassifiable.
Seminole County		Attainment/Unclassifiable.
Sumter County		Attainment/Unclassifiable.
Suwannee County		Attainment/Unclassifiable.
Taylor County		Attainment/Unclassifiable.
Union County		Attainment/Unclassifiable.
Volusia County		Attainment/Unclassifiable.
Wakulla County		Attainment/Unclassifiable.
Walton County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
1 This date is April 9, 2018, unless otherwise noted.
2 Excludes Indian country located in each area, if any, unless otherwise specified.
3 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.

* * * * *

12. Section 81.311 is amended by revising the table entitled “Georgia—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.311

Georgia.

* * * * *

Georgia—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Juliette, GA	9/12/16	Attainment/Unclassifiable.
Butts County
Crawford County
Jasper County
Jones County
Lamar County
Monroe County
Upson County
Rest of State: 3
Appling County		Attainment/Unclassifiable.
Atkinson County		Attainment/Unclassifiable.
Bacon County		Attainment/Unclassifiable.
Baker County		Attainment/Unclassifiable.
Baldwin County		Attainment/Unclassifiable.
Banks County		Attainment/Unclassifiable.
Barrow County		Attainment/Unclassifiable.
Bartow County		Attainment/Unclassifiable.
Ben Hill County		Attainment/Unclassifiable.
Berrien County		Attainment/Unclassifiable.
Bibb County		Attainment/Unclassifiable.
Bleckley County		Attainment/Unclassifiable.
Brantley County		Attainment/Unclassifiable.
Brooks County		Attainment/Unclassifiable.
Bryan County		Attainment/Unclassifiable.
Bulloch County		Attainment/Unclassifiable.
Burke County		Attainment/Unclassifiable.
Calhoun County		Attainment/Unclassifiable.
Camden County		Attainment/Unclassifiable.
Candler County		Attainment/Unclassifiable.
Carroll County		Attainment/Unclassifiable.
Catoosa County		Attainment/Unclassifiable.
Charlton County		Attainment/Unclassifiable.
Chatham County		Attainment/Unclassifiable.
Chattahoochee County		Attainment/Unclassifiable.
Chattooga County		Attainment/Unclassifiable.
Cherokee County		Attainment/Unclassifiable.
Clarke County		Attainment/Unclassifiable.
Clay County		Attainment/Unclassifiable.
Clayton County		Attainment/Unclassifiable.
Clinch County		Attainment/Unclassifiable.
Cobb County		Attainment/Unclassifiable.
Coffee County		Attainment/Unclassifiable.
Colquitt County		Attainment/Unclassifiable.
Columbia County		Attainment/Unclassifiable.
Cook County		Attainment/Unclassifiable.
Coweta County		Attainment/Unclassifiable.
Crisp County		Attainment/Unclassifiable.
Dade County		Attainment/Unclassifiable.
Dawson County		Attainment/Unclassifiable.
Decatur County		Attainment/Unclassifiable.
DeKalb County		Attainment/Unclassifiable.
Dodge County		Attainment/Unclassifiable.
Dooly County		Attainment/Unclassifiable.
Dougherty County		Attainment/Unclassifiable.
Douglas County		Attainment/Unclassifiable.
Early County		Attainment/Unclassifiable.
Echols County		Attainment/Unclassifiable.
Effingham County		Attainment/Unclassifiable.
Elbert County		Attainment/Unclassifiable.
Emanuel County		Attainment/Unclassifiable.
Evans County		Attainment/Unclassifiable.
Fannin County		Attainment/Unclassifiable.
Fayette County		Attainment/Unclassifiable.
Forsyth County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Fulton County		Attainment/Unclassifiable.
Gilmer County		Attainment/Unclassifiable.
Glascock County		Attainment/Unclassifiable.
Glynn County		Attainment/Unclassifiable.
Gordon County		Attainment/Unclassifiable.
Grady County		Attainment/Unclassifiable.
Greene County		Attainment/Unclassifiable.
Gwinnett County		Attainment/Unclassifiable.
Habersham County		Attainment/Unclassifiable.
Hall County		Attainment/Unclassifiable.
Hancock County		Attainment/Unclassifiable.
Harris County		Attainment/Unclassifiable.
Hart County		Attainment/Unclassifiable.
Heard County		Attainment/Unclassifiable.
Henry County		Attainment/Unclassifiable.
Houston County		Attainment/Unclassifiable.
Irwin County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jeff Davis County		Attainment/Unclassifiable.
Jefferson County		Attainment/Unclassifiable.
Jenkins County		Attainment/Unclassifiable.
Johnson County		Attainment/Unclassifiable.
Lanier County		Attainment/Unclassifiable.
Laurens County		Attainment/Unclassifiable.
Lee County		Attainment/Unclassifiable.
Liberty County		Attainment/Unclassifiable.
Lincoln County		Attainment/Unclassifiable.
Long County		Attainment/Unclassifiable.
Lowndes County		Attainment/Unclassifiable.
Lumpkin County		Attainment/Unclassifiable.
Macon County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Marion County		Attainment/Unclassifiable.
McDuffie County		Attainment/Unclassifiable.
McIntosh County		Attainment/Unclassifiable.
Miller County		Attainment/Unclassifiable.
Mitchell County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Morgan County		Attainment/Unclassifiable.
Murray County		Attainment/Unclassifiable.
Muscogee County		Attainment/Unclassifiable.
Newton County		Attainment/Unclassifiable.
Oconee County		Attainment/Unclassifiable.
Oglethorpe County		Attainment/Unclassifiable.
Paulding County		Attainment/Unclassifiable.
Peach County		Attainment/Unclassifiable.
Pickens County		Attainment/Unclassifiable.
Pierce County		Attainment/Unclassifiable.
Pike County		Attainment/Unclassifiable.
Polk County		Attainment/Unclassifiable.
Pulaski County		Attainment/Unclassifiable.
Putnam County		Attainment/Unclassifiable.
Quitman County		Attainment/Unclassifiable.
Rabun County		Attainment/Unclassifiable.
Randolph County		Attainment/Unclassifiable.
Richmond County		Attainment/Unclassifiable.
Rockdale County		Attainment/Unclassifiable.
Schley County		Attainment/Unclassifiable.
Screven County		Attainment/Unclassifiable.
Seminole County		Attainment/Unclassifiable.
Spalding County		Attainment/Unclassifiable.
Stephens County		Attainment/Unclassifiable.
Stewart County		Attainment/Unclassifiable.
Sumter County		Attainment/Unclassifiable.
Talbot County		Attainment/Unclassifiable.
Taliaferro County		Attainment/Unclassifiable.
Tattnall County		Attainment/Unclassifiable.
Taylor County		Attainment/Unclassifiable.
Telfair County		Attainment/Unclassifiable.
Terrell County		Attainment/Unclassifiable.
Thomas County		Attainment/Unclassifiable.
Tift County		Attainment/Unclassifiable.
Toombs County		Attainment/Unclassifiable.
Towns County		Attainment/Unclassifiable.
Treutlen County		Attainment/Unclassifiable.
Troup County		Attainment/Unclassifiable.
Turner County		Attainment/Unclassifiable.
Twiggs County		Attainment/Unclassifiable.
Union County		Attainment/Unclassifiable.
Walker County		Attainment/Unclassifiable.
Walton County		Attainment/Unclassifiable.
Ware County		Attainment/Unclassifiable.
Warren County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Wayne County		Attainment/Unclassifiable.
Webster County		Attainment/Unclassifiable.
Wheeler County		Attainment/Unclassifiable.
White County		Attainment/Unclassifiable.
Whitfield County		Attainment/Unclassifiable.
Wilcox County		Attainment/Unclassifiable.
Wilkes County		Attainment/Unclassifiable.
Wilkinson County		Attainment/Unclassifiable.
Worth County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Floyd County will be designated by December 31, 2020.

* * * * *

13. Section 81.312 is amended by revising the table entitled “Hawaii—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.312

Hawaii.

* * * * *

Hawaii—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Hawaii County	9/12/16	Attainment/Unclassifiable.
Kalawao County		Attainment/Unclassifiable.
Kauai County		Attainment/Unclassifiable.
Maui County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Honolulu County will be designated by December 31, 2020.

* * * * *

14. Section 81.313 is amended by adding a table entitled “Idaho—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Idaho—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.313

Idaho.

* * * * *

Idaho—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Entire State		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

15. Section 81.314 is amended by revising the table entitled “Illinois—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.314

Illinois.

* * * * *

Illinois—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Alton Township, IL	9/12/16	Nonattainment.
Madison County (part)
Within Alton Township: Area east of Corporal Belchik Memorial Expressway, south of East Broadway, south of Route 3, and north of Route 143
Lemont, IL	10/4/13	Nonattainment.
Cook County (part)
Lemont Township
Will County (part)
DuPage Township and Lockport Township
Pekin, IL	10/4/13	Nonattainment.
Tazewell County (part)
Cincinnati Township and Pekin Township
Peoria County (part)
Hollis Township
Williamson County, IL	9/12/16	Nonattainment.
Williamson County
Jasper County, IL	9/12/16	Attainment/Unclassifiable.
Jasper County
Massac County, IL	9/12/16	Attainment/Unclassifiable.
Massac County
Putnam/Bureau Counties, IL	9/12/16	Attainment/Unclassifiable.
Bureau County
Putnam County
Wood River Township, IL	9/12/16	Attainment/Unclassifiable.
Madison County (part)
All of Wood River Township, and the area in Chouteau Township north of Cahokia Diversion Channel
Adams County		Attainment/Unclassifiable.
Alexander County		Attainment/Unclassifiable.
Bond County		Attainment/Unclassifiable.
Boone County		Attainment/Unclassifiable.
Brown County		Attainment/Unclassifiable.
Calhoun County		Attainment/Unclassifiable.
Carroll County		Attainment/Unclassifiable.
Cass County		Attainment/Unclassifiable.
Champaign County		Attainment/Unclassifiable.
Christian County		Attainment/Unclassifiable.
Clark County		Attainment/Unclassifiable.
Clay County		Attainment/Unclassifiable.
Clinton County		Attainment/Unclassifiable.
Coles County		Attainment/Unclassifiable.
Cook County (part) (remainder)		Attainment/Unclassifiable.
Crawford County		Attainment/Unclassifiable.
Cumberland County		Attainment/Unclassifiable.
De Kalb County		Attainment/Unclassifiable.
De Witt County		Attainment/Unclassifiable.
Douglas County		Attainment/Unclassifiable.
Du Page County		Attainment/Unclassifiable.
Edgar County		Attainment/Unclassifiable.
Edwards County		Attainment/Unclassifiable.
Effingham County		Attainment/Unclassifiable.
Fayette County		Attainment/Unclassifiable.
Ford County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Fulton County		Attainment/Unclassifiable.
Gallatin County		Attainment/Unclassifiable.
Greene County		Attainment/Unclassifiable.
Grundy County		Attainment/Unclassifiable.
Hamilton County		Attainment/Unclassifiable.
Hancock County		Attainment/Unclassifiable.
Hardin County		Attainment/Unclassifiable.
Henderson County		Attainment/Unclassifiable.
Henry County		Attainment/Unclassifiable.
Iroquois County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jefferson County		Attainment/Unclassifiable.
Jersey County		Attainment/Unclassifiable.
Jo Daviess County		Attainment/Unclassifiable.
Johnson County		Attainment/Unclassifiable.
Kane County		Attainment/Unclassifiable.
Kankakee County		Attainment/Unclassifiable.
Kendall County		Attainment/Unclassifiable.
Knox County		Attainment/Unclassifiable.
Lake County		Attainment/Unclassifiable.
La Salle County		Attainment/Unclassifiable.
Lawrence County		Attainment/Unclassifiable.
Lee County		Attainment/Unclassifiable.
Livingston County		Attainment/Unclassifiable.
Logan County		Attainment/Unclassifiable.
McDonough County		Attainment/Unclassifiable.
McHenry County		Attainment/Unclassifiable.
McLean County		Attainment/Unclassifiable.
Macoupin County		Attainment/Unclassifiable.
Madison County (part) (remainder)		Attainment/Unclassifiable.
Marion County		Attainment/Unclassifiable.
Marshall County		Attainment/Unclassifiable.
Mason County		Attainment/Unclassifiable.
Menard County		Attainment/Unclassifiable.
Mercer County		Attainment/Unclassifiable.
Monroe County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Morgan County		Attainment/Unclassifiable.
Moultrie County		Attainment/Unclassifiable.
Ogle County		Attainment/Unclassifiable.
Peoria County (part) (remainder)		Attainment/Unclassifiable.
Perry County		Attainment/Unclassifiable.
Piatt County		Attainment/Unclassifiable.
Pike County		Attainment/Unclassifiable.
Pope County		Attainment/Unclassifiable.
Pulaski County		Attainment/Unclassifiable.
Randolph County		Attainment/Unclassifiable.
Richland County		Attainment/Unclassifiable.
Rock Island County		Attainment/Unclassifiable.
St. Clair County		Attainment/Unclassifiable.
Saline County		Attainment/Unclassifiable.
Sangamon County		Attainment/Unclassifiable.
Schuyler County		Attainment/Unclassifiable.
Scott County		Attainment/Unclassifiable.
Shelby County		Attainment/Unclassifiable.
Stark County		Attainment/Unclassifiable.
Stephenson County		Attainment/Unclassifiable.
Tazewell County (part) (remainder)		Attainment/Unclassifiable.
Union County		Attainment/Unclassifiable.
Vermilion County		Attainment/Unclassifiable.
Wabash County		Attainment/Unclassifiable.
Warren County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Wayne County		Attainment/Unclassifiable.
White County		Attainment/Unclassifiable.
Whiteside County		Attainment/Unclassifiable.
Will County (part) (remainder)		Attainment/Unclassifiable.
Winnebago County		Attainment/Unclassifiable.
Woodford County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Macon County will be designated by December 31, 2020.

* * * * *

16. Section 81.315 is amended by revising the table entitled “Indiana—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.315

Indiana.

* * * * *

Indiana—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Huntington, IN		Nonattainment.
Huntington County (part)
Huntington Township
Indianapolis, IN	10/4/13	Nonattainment.
Marion County (part)
Wayne Township, Center Township, Perry Township
Morgan County, IN	10/4/13	Nonattainment.
Morgan County (part)
Clay Township, Washington Township
Southwest Indiana, IN	10/4/13	Nonattainment.
Daviess County (part)
Veale Township
Pike County (part)
Washington Township
Terre Haute, IN	10/4/13	Nonattainment.
Vigo County (part)
Fayette Township, Harrison Township
Gibson County, IN	9/12/16	Attainment/Unclassifiable.
Gibson County
Jefferson County, IN	9/12/16	Attainment/Unclassifiable.
Jefferson County (part)
Graham, Lancaster, Madison, Monroe, Republican, Shelby, and Smyrna Townships
LaPorte County, IN	9/12/16	Attainment/Unclassifiable
LaPorte County
Posey County, IN	9/12/16	Attainment/Unclassifiable.
Posey County (part)
Bethel, Center, Harmony, Lynn, Marrs, Robb, Robinson, and Smith Townships
Spencer County, IN	9/12/16	Attainment/Unclassifiable.
Spencer County (part)
Ohio Township north of UTM 4187.580 km northing, and Carter, Clay, Grass, Hammond, Harrison, and Jackson Townships
Adams County		Attainment/Unclassifiable.
Allen County		Attainment/Unclassifiable.
Bartholomew County		Attainment/Unclassifiable.
Benton County		Attainment/Unclassifiable.
Blackford County		Attainment/Unclassifiable.
Boone County		Attainment/Unclassifiable.
Brown County		Attainment/Unclassifiable.
Carroll County		Attainment/Unclassifiable.
Cass County		Attainment/Unclassifiable.
Clark County		Attainment/Unclassifiable.
Clay County		Attainment/Unclassifiable.
Clinton County		Attainment/Unclassifiable.
Crawford County		Attainment/Unclassifiable.
Daviess County (part) (remainder)		Attainment/Unclassifiable.
Dearborn County		Attainment/Unclassifiable.
Decatur County		Attainment/Unclassifiable.
DeKalb County		Attainment/Unclassifiable.
Delaware County		Attainment/Unclassifiable.
Dubois County		Attainment/Unclassifiable.
Elkhart County		Attainment/Unclassifiable.
Fayette County		Attainment/Unclassifiable.
Floyd County		Attainment/Unclassifiable.
Fountain County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Fulton County		Attainment/Unclassifiable.
Grant County		Attainment/Unclassifiable.
Greene County		Attainment/Unclassifiable.
Hamilton County		Attainment/Unclassifiable.
Hancock County		Attainment/Unclassifiable.
Harrison County		Attainment/Unclassifiable.
Hendricks County		Attainment/Unclassifiable.
Henry County		Attainment/Unclassifiable.
Howard County		Attainment/Unclassifiable.
Huntington County (part) (remainder)		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jasper County		Attainment/Unclassifiable.
Jay County		Attainment/Unclassifiable.
Jefferson County		Attainment/Unclassifiable.
Jennings County		Attainment/Unclassifiable.
Johnson County		Attainment/Unclassifiable.
Knox County		Attainment/Unclassifiable.
Kosciusko County		Attainment/Unclassifiable.
LaGrange County		Attainment/Unclassifiable.
Lake County		Attainment/Unclassifiable.
Lawrence County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Marion County (part) (remainder)		Attainment/Unclassifiable.
Marshall County		Attainment/Unclassifiable.
Martin County		Attainment/Unclassifiable.
Miami County		Attainment/Unclassifiable.
Monroe County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Morgan County (part) (remainder)		Attainment/Unclassifiable.
Newton County		Attainment/Unclassifiable.
Noble County		Attainment/Unclassifiable.
Ohio County		Attainment/Unclassifiable.
Orange County		Attainment/Unclassifiable.
Owen County		Attainment/Unclassifiable.
Parke County		Attainment/Unclassifiable.
Perry County		Attainment/Unclassifiable.
Pike County (part) (remainder)		Attainment/Unclassifiable.
Posey County		Attainment/Unclassifiable.
Pulaski County		Attainment/Unclassifiable.
Putnam County		Attainment/Unclassifiable.
Randolph County		Attainment/Unclassifiable.
Ripley County		Attainment/Unclassifiable.
Rush County		Attainment/Unclassifiable.
St. Joseph County		Attainment/Unclassifiable.
Scott County		Attainment/Unclassifiable.
Shelby County		Attainment/Unclassifiable.
Spencer County		Attainment/Unclassifiable.
Starke County		Attainment/Unclassifiable.
Steuben County		Attainment/Unclassifiable.
Sullivan County		Attainment/Unclassifiable.
Switzerland County		Attainment/Unclassifiable.
Tippecanoe County		Attainment/Unclassifiable.
Tipton County		Attainment/Unclassifiable.
Union County		Attainment/Unclassifiable.
Vanderburgh County		Attainment/Unclassifiable.
Vermillion County		Attainment/Unclassifiable.
Vigo County (part) (remainder)		Attainment/Unclassifiable.
Wabash County		Attainment/Unclassifiable.
Warren County		Attainment/Unclassifiable.
Warrick County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Wayne County		Attainment/Unclassifiable.
Wells County		Attainment/Unclassifiable.
White County		Attainment/Unclassifiable.
Whitley County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Porter County will be designated by December 31, 2020.

* * * * *

17. Section 81.316 is amended by revising the table entitled “Iowa—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.316

Iowa.

* * * * *

Iowa—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Muscatine, IA	10/4/13	Nonattainment.
Muscatine County (part)
Sections 1-3, 10-15, 22-27, 34-36 of T77N, R3W (Lake Township)
Sections 1-3, 10-15, 22-27, 34-36 of T76N, R3W (Seventy-six Township)
T77N, R2W (Bloomington Township)
T76N, R2W (Fruitland Township)
All sections except 1, 12, 13, 24, 25, 36 of T77N, R1W (Sweetland Township)
Linn County, IA		Unclassifiable.
Linn County
Woodbury County, IA	9/12/16	Unclassifiable.
Woodbury County
Des Moines County, IA	9/12/16	Attainment/Unclassifiable.
Des Moines County
Louisa County, IA		Attainment/Unclassifiable.
Louisa County
Pottawattamie County, IA		Attainment/Unclassifiable.
Pottawattamie County
Wapello County, IA	9/12/16	Attainment/Unclassifiable.
Wapello County
Statewide:		Attainment/Unclassifiable.
Adair County
Adams County
Allamakee County
Appanoose County
Audubon County
Benton County
Black Hawk County
Boone County
Bremer County
Buchanan County
Buena Vista County
Butler County
Calhoun County
Carroll County
Cass County
Cedar County
Cerro Gordo County
Cherokee County
Chickasaw County
Clarke County
Clay County
Clayton County
Clinton County
Crawford County
Dallas County
Davis County
Decatur County
Delaware County
Dickinson County
Dubuque County
Emmet County
Fayette County
Floyd County
Franklin County
Fremont County
Greene County
Grundy County
Guthrie County
Hamilton County
Hancock County
Hardin County
Harrison County
Henry County
Howard County
Humboldt County
Ida County
Iowa County
Jackson County
Jasper County
Jefferson County
Johnson County
Jones County
Keokuk County
Kossuth County
Lee County
Lucas County
Lyon County
Madison County
Mahaska County
Marion County
Marshall County
Mills County
Mitchell County
Monona County
Monroe County
Montgomery County
Muscatine County (portion of Muscatine County not designated Nonattainment on 10/4/13)
O'Brien County
Osceola County
Page County
Palo Alto County
Plymouth County
Pocahontas County
Polk County
Poweshiek County
Ringgold County
Sac County
Scott County
Shelby County
Sioux County
Story County
Tama County
Taylor County
Union County
Van Buren County
Warren County
Washington County
Wayne County
Webster County
Winnebago County
Winneshiek County
Worth County
Wright County
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

18. Section 81.317 is amended by revising the table entitled “Kansas—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.317

Kansas.

* * * * *

Kansas—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Shawnee County, KS	9/12/16	Unclassifiable.
Shawnee County
Wyandotte County, KS	9/12/16	Unclassifiable.
Wyandotte County
Linn County, KS	9/12/16	Attainment/Unclassifiable.
Linn County
Statewide:		Attainment/Unclassifiable.
Allen County
Anderson County
Atchison County
Barber County
Barton County
Bourbon County
Brown County
Butler County
Chase County
Chautauqua County
Cherokee County
Cheyenne County
Clark County
Clay County
Cloud County
Coffey County
Comanche County
Cowley County
Crawford County
Decatur County
Dickinson County
Doniphan County
Douglas County
Edwards County
Elk County
Ellis County
Ellsworth County
Finney County
Ford County
Franklin County
Geary County
Gove County
Graham County
Grant County
Gray County
Greeley County
Greenwood County
Hamilton County
Harper County
Harvey County
Haskell County
Hodgeman County
Jackson County
Jefferson County
Jewell County
Johnson County
Kearny County
Kingman County
Kiowa County
Labette County
Lane County
Leavenworth County
Lincoln County
Logan County
Lyon County
Marion County
Marshall County
McPherson County
Meade County
Miami County
Mitchell County
Montgomery County
Morris County
Morton County
Nemaha County
Neosho County
Ness County
Norton County
Osage County
Osborne County
Ottawa County
Pawnee County
Phillips County
Pottawatomie County
Pratt County
Rawlins County
Reno County
Republic County
Rice County
Riley County
Rooks County
Rush County
Russell County
Saline County
Scott County
Sedgwick County
Seward County
Sheridan County
Sherman County
Smith County
Stafford County
Stanton County
Stevens County
Sumner County
Thomas County
Trego County
Wabaunsee County
Wallace County
Washington County
Wichita County
Wilson County
Woodson County
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

19. Section 81.318 is amended by revising the table entitled “Kentucky—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.318

Kentucky.

* * * * *

Kentucky—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 4	Designation
	Date 1	Type
Campbell-Clermont Counties, KY-OH: 2	3/10/2017	Attainment.
Campbell County (part)
That portion of Campbell County which lies south and west of the Ohio River described as follows: Beginning at geographic coordinates 38.9735 North Latitude, 84.3017 West Longitude (NAD 1983) on the edge of the Ohio River running southwesterly to KY Highway 1566; thence continuing running southwesterly along KY Highway 1566 to KY Highway 9 (AA Highway); thence running northwesterly along KY Highway 9 (AA Highway) from Hwy 1566 to Interstate 275; thence running northeasterly along Interstate 275 to Highway 2345 (John's Hill Road), Hwy 2345 to US-27, US-27 to I-275, I-275 to the Ohio River; thence running southeasterly along the Ohio River from Interstate 275 to geographic coordinates 38.9735 North Latitude, 84.3017 West Longitude (NAD 1983).
Jefferson County, KY 2	10/4/13	Nonattainment.
Jefferson County (part)
That portion of Jefferson County compassed by the polygon with the vertices using Universal Traverse Mercator (UTM) coordinates in UTM zone 16 with datum NAD83 as follows:
(1) Ethan Allen Way extended to the Ohio River at UTM Easting (m) 595738, UTM Northing 4214086 and Dixie Highway (US60 and US31W) at UTM Easting (m) 59751, UTM Northing 4212946;
(2) Along Dixie Highway from UTM Easting (m) 597515, UTM Northing 4212946 to UTM Easting (m) 595859, UTM Northing 4210678;
(3) Near the adjacent property lines of Louisville Gas and Electric-Mill Creek Electric Generating Station and Kosmos Cement where they join Dixie Highway at UTM Easting (m) 595859, UTM Northing 4210678 and the Ohio River at UTM Easting (m) 595326, UTM Northing 4211014;
(4) Along the Ohio River from UTM Easting (m) 595326, UTM Northing 4211014 to UTM Easting (m) 595738, UTM Northing 4214086
Ohio County, KY 2	9/12/16	Unclassifiable.
Ohio County
Pulaski County, KY 2	9/12/16	Unclassifiable.
Pulaski County
Rest of State: 3
Adair County		Attainment/Unclassifiable.
Allen County		Attainment/Unclassifiable.
Anderson County		Attainment/Unclassifiable.
Ballard County		Attainment/Unclassifiable.
Barren County		Attainment/Unclassifiable.
Bath County		Attainment/Unclassifiable.
Bell County		Attainment/Unclassifiable.
Boone County		Attainment/Unclassifiable.
Bourbon County		Attainment/Unclassifiable.
Boyd County		Attainment/Unclassifiable.
Boyle County		Attainment/Unclassifiable.
Bracken County		Attainment/Unclassifiable.
Breathitt County		Attainment/Unclassifiable.
Breckinridge County		Attainment/Unclassifiable.
Bullitt County		Attainment/Unclassifiable.
Butler County		Attainment/Unclassifiable.
Caldwell County		Attainment/Unclassifiable.
Calloway County		Attainment/Unclassifiable.
Campbell County (part) (remainder)		Attainment/Unclassifiable.
Carlisle County		Attainment/Unclassifiable.
Carroll County		Attainment/Unclassifiable.
Carter County		Attainment/Unclassifiable.
Casey County		Attainment/Unclassifiable.
Christian County		Attainment/Unclassifiable.
Clark County		Attainment/Unclassifiable.
Clay County		Attainment/Unclassifiable.
Clinton County		Attainment/Unclassifiable.
Crittenden County		Attainment/Unclassifiable.
Cumberland County		Attainment/Unclassifiable.
Daviess County		Attainment/Unclassifiable.
Edmonson County		Attainment/Unclassifiable.
Elliott County		Attainment/Unclassifiable.
Estill County		Attainment/Unclassifiable.
Fayette County		Attainment/Unclassifiable.
Fleming County		Attainment/Unclassifiable.
Floyd County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Fulton County		Attainment/Unclassifiable.
Gallatin County		Attainment/Unclassifiable.
Garrard County		Attainment/Unclassifiable.
Grant County		Attainment/Unclassifiable.
Graves County		Attainment/Unclassifiable.
Grayson County		Attainment/Unclassifiable.
Green County		Attainment/Unclassifiable.
Greenup County		Attainment/Unclassifiable.
Hancock County		Attainment/Unclassifiable.
Hardin County		Attainment/Unclassifiable.
Harlan County		Attainment/Unclassifiable.
Harrison County		Attainment/Unclassifiable.
Hart County		Attainment/Unclassifiable.
Henderson County (part) 4		Attainment/Unclassifiable.
Census Block Groups 211010207013, 211010207014, 211010207024, and 211010208004
Henry County		Attainment/Unclassifiable.
Hickman County		Attainment/Unclassifiable.
Hopkins County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jefferson County (part) (remainder)		Attainment/Unclassifiable.
Jessamine County		Attainment/Unclassifiable.
Johnson County		Attainment/Unclassifiable.
Kenton County		Attainment/Unclassifiable.
Knott County		Attainment/Unclassifiable.
Knox County		Attainment/Unclassifiable.
LaRue County		Attainment/Unclassifiable.
Laurel County		Attainment/Unclassifiable.
Lawrence County		Attainment/Unclassifiable.
Lee County		Attainment/Unclassifiable.
Leslie County		Attainment/Unclassifiable.
Letcher County		Attainment/Unclassifiable.
Lewis County		Attainment/Unclassifiable.
Lincoln County		Attainment/Unclassifiable.
Livingston County		Attainment/Unclassifiable.
Logan County		Attainment/Unclassifiable.
Lyon County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Magoffin County		Attainment/Unclassifiable.
Marion County		Attainment/Unclassifiable.
Marshall County		Attainment/Unclassifiable.
Martin County		Attainment/Unclassifiable.
Mason County		Attainment/Unclassifiable.
McCracken County		Attainment/Unclassifiable.
McCreary County		Attainment/Unclassifiable.
McLean County		Attainment/Unclassifiable.
Meade County		Attainment/Unclassifiable.
Menifee County		Attainment/Unclassifiable.
Mercer County		Attainment/Unclassifiable.
Metcalfe County		Attainment/Unclassifiable.
Monroe County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Morgan County		Attainment/Unclassifiable.
Muhlenberg County		Attainment/Unclassifiable.
Nelson County		Attainment/Unclassifiable.
Nicholas County		Attainment/Unclassifiable.
Oldham County		Attainment/Unclassifiable.
Owen County		Attainment/Unclassifiable.
Owsley County		Attainment/Unclassifiable.
Pendleton County		Attainment/Unclassifiable.
Perry County		Attainment/Unclassifiable.
Pike County		Attainment/Unclassifiable.
Powell County		Attainment/Unclassifiable.
Robertson County		Attainment/Unclassifiable.
Rockcastle County		Attainment/Unclassifiable.
Rowan County		Attainment/Unclassifiable.
Russell County		Attainment/Unclassifiable.
Scott County		Attainment/Unclassifiable.
Shelby County		Attainment/Unclassifiable.
Simpson County		Attainment/Unclassifiable.
Spencer County		Attainment/Unclassifiable.
Taylor County		Attainment/Unclassifiable.
Todd County		Attainment/Unclassifiable.
Trigg County		Attainment/Unclassifiable.
Trimble County		Attainment/Unclassifiable.
Union County		Attainment/Unclassifiable.
Warren County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Wayne County		Attainment/Unclassifiable.
Whitley County		Attainment/Unclassifiable.
Wolfe County		Attainment/Unclassifiable.
Woodford County		Attainment/Unclassifiable.
1 This date is April 9, 2018, unless otherwise noted.
2 Excludes Indian country located in each area, if any, unless otherwise specified.
3 Includes any Indian country in each county or area, if any, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
4 Webster County and the remainder of Henderson County will be designated by December 31, 2020.

* * * * *

20. Section 81.319 is amended by revising the table entitled “Louisiana—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.319

Louisiana.

* * * * *

Louisiana—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Evangeline Parish (Partial)		Nonattainment.
Portion of Evangeline Parish bounded by:
570250m E, 3400300m N
570250m E, 3403300m N
572400m E, 3403300m N
572400m E, 3400300m N
NAD83 15R
St. Bernard Parish, LA	10/4/13	Nonattainment.
Calcasieu Parish, LA	9/12/16	Unclassifiable.
St. Mary Parish		Unclassifiable.
Acadia Parish		Attainment/Unclassifiable.
Allen Parish		Attainment/Unclassifiable.
Assumption Parish		Attainment/Unclassifiable.
Avoyelles Parish		Attainment/Unclassifiable.
Beauregard Parish		Attainment/Unclassifiable.
Bienville Parish		Attainment/Unclassifiable.
Bossier Parish		Attainment/Unclassifiable.
Caddo Parish		Attainment/Unclassifiable.
Caldwell Parish		Attainment/Unclassifiable.
Cameron Parish		Attainment/Unclassifiable.
Catahoula Parish		Attainment/Unclassifiable.
Claiborne Parish		Attainment/Unclassifiable.
Concordia Parish		Attainment/Unclassifiable.
De Soto Parish	9/12/16	Attainment/Unclassifiable.
East Carroll Parish		Attainment/Unclassifiable.
East Feliciana Parish		Attainment/Unclassifiable.
Evangeline Parish (part) (remainder)		Attainment/Unclassifiable.
Franklin Parish		Attainment/Unclassifiable.
Grant Parish		Attainment/Unclassifiable.
Iberia Parish		Attainment/Unclassifiable.
Iberville Parish		Attainment/Unclassifiable.
Jackson Parish		Attainment/Unclassifiable.
Jefferson Parish		Attainment/Unclassifiable.
Jefferson Davis Parish		Attainment/Unclassifiable.
Lafayette Parish		Attainment/Unclassifiable.
Lafourche Parish		Attainment/Unclassifiable.
LaSalle Parish		Attainment/Unclassifiable.
Lincoln Parish		Attainment/Unclassifiable.
Livingston Parish		Attainment/Unclassifiable.
Madison Parish		Attainment/Unclassifiable.
Morehouse Parish		Attainment/Unclassifiable.
Natchitoches Parish		Attainment/Unclassifiable.
Orleans Parish		Attainment/Unclassifiable.
Ouachita Parish		Attainment/Unclassifiable.
Plaquemines Parish		Attainment/Unclassifiable.
Point Coupee		Attainment/Unclassifiable.
Rapides Parish		Attainment/Unclassifiable.
Red River Parish		Attainment/Unclassifiable.
Richland Parish		Attainment/Unclassifiable.
Sabine Parish		Attainment/Unclassifiable.
St. Helena Parish		Attainment/Unclassifiable.
St. John the Baptist Parish		Attainment/Unclassifiable.
St. Landry Parish		Attainment/Unclassifiable.
St. Martin Parish		Attainment/Unclassifiable.
St. Mary Parish		Attainment/Unclassifiable.
St. Tammany Parish		Attainment/Unclassifiable.
Tangipahoa Parish		Attainment/Unclassifiable.
Tensas Parish		Attainment/Unclassifiable.
Terrebonne Parish		Attainment/Unclassifiable.
Union Parish		Attainment/Unclassifiable.
Vermilion Parish		Attainment/Unclassifiable.
Vernon Parish		Attainment/Unclassifiable.
Washington Parish		Attainment/Unclassifiable.
Webster Parish		Attainment/Unclassifiable.
West Carroll Parish		Attainment/Unclassifiable.
Winn Parish		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 East Baton Rouge, St. Charles, St. James, and West Baton Rouge Parishes will be designated by December 31, 2020.

* * * * *

21. Section 81.320 is amended by adding a table entitled “Maine—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Maine—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.320

Maine.

* * * * *

Maine—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Statewide:		Attainment/Unclassifiable.
Androscoggin County
Aroostook County
Cumberland County
Franklin County
Hancock County
Kennebec County
Knox County
Lincoln County
Oxford County
Penobscot County
Piscataquis County
Sagadahoc County
Somerset County
Waldo County
Washington County
York County
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

22. Section 81.321 is amended by revising the table entitled “Maryland—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.321

Maryland.

* * * * *

Maryland—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Anne Arundel County and Baltimore County, MD1	9/12/16	Nonattainment.
Anne Arundel County (part)
Portions of Anne Arundel County that are within 26.8 kilometers of Herbert A. Wagner's Unit 3 stack, which is located at 39.17765 N. latitude, 76.52752 W. longitude
Baltimore County (part)
Portions of Baltimore County that are within 26.8 kilometers of Herbert A. Wagner's Unit 3 stack, which is located at 39.17765 N. latitude, 76.52752 W. longitude
Anne Arundel County (part)		Attainment/Unclassifiable.
Remainder of County
Baltimore City, MD	9/12/16	Attainment/Unclassifiable.
Baltimore County (part)		Attainment/Unclassifiable.
Remainder of County
Calvert County		Attainment/Unclassifiable.
Caroline County		Attainment/Unclassifiable.
Carroll County		Attainment/Unclassifiable.
Cecil County		Attainment/Unclassifiable.
Charles County		Attainment/Unclassifiable.
Dorchester County		Attainment/Unclassifiable.
Frederick County		Attainment/Unclassifiable.
Garrett County		Attainment/Unclassifiable.
Harford County		Attainment/Unclassifiable.
Howard County		Attainment/Unclassifiable.
Kent County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Prince George's County		Attainment/Unclassifiable.
Queen Anne's County		Attainment/Unclassifiable.
Somerset County		Attainment/Unclassifiable.
St. Mary's County		Attainment/Unclassifiable.
Talbot County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Wicomico County		Attainment/Unclassifiable.
Worcester County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Allegany County will be designated by December 31, 2020.

* * * * *

23. Section 81.322 is amended by adding a table entitled “Massachusetts—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Massachusetts—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.322

Massachusetts.

* * * * *

Massachusetts—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Statewide:
Barnstable County		Attainment/Unclassifiable.
Berkshire County		Attainment/Unclassifiable.
Bristol County		Attainment/Unclassifiable.
Dukes County		Attainment/Unclassifiable.
Essex County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Hampden County		Attainment/Unclassifiable.
Hampshire County		Attainment/Unclassifiable.
Middlesex County		Attainment/Unclassifiable.
Nantucket County		Attainment/Unclassifiable.
Norfolk County		Attainment/Unclassifiable.
Plymouth County		Attainment/Unclassifiable.
Suffolk County		Attainment/Unclassifiable.
Worcester County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

24. Section 81.323 is amended by revising the table entitled “Michigan—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.323

Michigan.

* * * * *

Michigan—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Detroit, MI	10/4/13	Nonattainment.
Wayne County (part)
The area bounded on the east by the Michigan-Ontario border, on the south by the Wayne County-Monroe County border, on the west by Interstate 75 north to Southfield Road, Southfield Road to Interstate 94, and Interstate 94 north to Michigan Avenue, and on the north by Michigan Avenue to Woodward Avenue and a line on Woodward Avenue extended to the Michigan-Ontario border.
St. Clair, MI	9/12/16	Nonattainment.
St. Clair County (part)
Area defined by the St. Clair River for the eastern boundary, an extension from the St. Clair River straight west to the intersection of State Highway M-29 and St. Clair River Drive, continuing west on State Highway M-29 to Church Road to Arnold Road to County Line Road for the southern boundary, County Line Road and the Macomb/St. Clair County boundary to Stoddard Road to Wales Ridge Road for the western boundary, and Alpine Road to Fitz Road to Smith Creek Road to Range Road to Huron Avenue, extending straight east from the intersection of Huron Road and River Road to the St. Clair River for the northern boundary.
Bay County, MI	9/12/16	Attainment/Unclassifiable.
Bay County
Lansing, MI	9/12/16	Attainment/Unclassifiable.
Eaton County
Ingham County
Marquette County, MI	9/12/16	Attainment/Unclassifiable.
Marquette County
Monroe County, MI	9/12/16	Attainment/Unclassifiable.
Monroe County
Ottawa County, MI	9/12/16	Attainment/Unclassifiable.
Ottawa County
Alcona County		Attainment/Unclassifiable.
Alger County		Attainment/Unclassifiable.
Allegan County		Attainment/Unclassifiable.
Alpena County		Attainment/Unclassifiable.
Antrim County		Attainment/Unclassifiable.
Arenac County		Attainment/Unclassifiable.
Baraga County		Attainment/Unclassifiable.
Barry County		Attainment/Unclassifiable.
Benzie County		Attainment/Unclassifiable.
Berrien County		Attainment/Unclassifiable.
Branch County		Attainment/Unclassifiable.
Calhoun County		Attainment/Unclassifiable.
Cass County		Attainment/Unclassifiable.
Charlevoix County		Attainment/Unclassifiable.
Cheboygan County		Attainment/Unclassifiable.
Chippewa County		Attainment/Unclassifiable.
Clare County		Attainment/Unclassifiable.
Clinton County		Attainment/Unclassifiable.
Crawford County		Attainment/Unclassifiable.
Delta County		Attainment/Unclassifiable.
Dickinson County		Attainment/Unclassifiable.
Emmet County		Attainment/Unclassifiable.
Genesee County		Attainment/Unclassifiable.
Gladwin County		Attainment/Unclassifiable.
Gogebic County		Attainment/Unclassifiable.
Grand Traverse County		Attainment/Unclassifiable.
Gratiot County		Attainment/Unclassifiable.
Hillsdale County		Attainment/Unclassifiable.
Houghton County		Attainment/Unclassifiable.
Huron County		Attainment/Unclassifiable.
Ionia County		Attainment/Unclassifiable.
Iosco County		Attainment/Unclassifiable.
Iron County		Attainment/Unclassifiable.
Isabella County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Kalamazoo County		Attainment/Unclassifiable.
Kalkaska County		Attainment/Unclassifiable.
Kent County		Attainment/Unclassifiable.
Keweenaw County		Attainment/Unclassifiable.
Lake County		Attainment/Unclassifiable.
Lapeer County		Attainment/Unclassifiable.
Leelanau County		Attainment/Unclassifiable.
Lenawee County		Attainment/Unclassifiable.
Livingston County		Attainment/Unclassifiable.
Luce County		Attainment/Unclassifiable.
Mackinac County		Attainment/Unclassifiable.
Macomb County		Attainment/Unclassifiable.
Manistee County		Attainment/Unclassifiable.
Mason County		Attainment/Unclassifiable.
Mecosta County		Attainment/Unclassifiable.
Menominee County		Attainment/Unclassifiable.
Midland County		Attainment/Unclassifiable.
Missaukee County		Attainment/Unclassifiable.
Montcalm County		Attainment/Unclassifiable.
Montmorency County		Attainment/Unclassifiable.
Muskegon County		Attainment/Unclassifiable.
Newaygo County		Attainment/Unclassifiable.
Oakland County		Attainment/Unclassifiable.
Oceana County		Attainment/Unclassifiable.
Ogemaw County		Attainment/Unclassifiable.
Ontonagon County		Attainment/Unclassifiable.
Osceola County		Attainment/Unclassifiable.
Oscoda County		Attainment/Unclassifiable.
Otsego County		Attainment/Unclassifiable.
Presque Isle County		Attainment/Unclassifiable.
Roscommon County		Attainment/Unclassifiable.
Saginaw County		Attainment/Unclassifiable.
St. Clair County (remainder)		Attainment/Unclassifiable.
St. Joseph County		Attainment/Unclassifiable.
Sanilac County		Attainment/Unclassifiable.
Schoolcraft County		Attainment/Unclassifiable.
Shiawassee County		Attainment/Unclassifiable.
Tuscola County		Attainment/Unclassifiable.
Van Buren County		Attainment/Unclassifiable.
Washtenaw County		Attainment/Unclassifiable.
Wayne County (remainder)		Attainment/Unclassifiable.
Wexford County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

25. Section 81.324 is amended by adding a table entitled “Minnesota—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Minnesota—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.324

Minnesota.

* * * * *

Minnesota—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Goodhue County		Unclassifiable.
Aitkin County		Attainment/Unclassifiable.
Anoka County		Attainment/Unclassifiable.
Becker County		Attainment/Unclassifiable.
Beltrami County		Attainment/Unclassifiable.
Benton County		Attainment/Unclassifiable.
Big Stone County		Attainment/Unclassifiable.
Blue Earth County		Attainment/Unclassifiable.
Brown County		Attainment/Unclassifiable.
Carlton County		Attainment/Unclassifiable.
Carver County		Attainment/Unclassifiable.
Cass County		Attainment/Unclassifiable.
Chippewa County		Attainment/Unclassifiable.
Chisago County		Attainment/Unclassifiable.
Clay County		Attainment/Unclassifiable.
Clearwater County		Attainment/Unclassifiable.
Cook County		Attainment/Unclassifiable.
Cottonwood County		Attainment/Unclassifiable.
Crow Wing County		Attainment/Unclassifiable.
Dakota County		Attainment/Unclassifiable.
Dodge County		Attainment/Unclassifiable.
Douglas County		Attainment/Unclassifiable.
Faribault County		Attainment/Unclassifiable.
Fillmore County		Attainment/Unclassifiable.
Freeborn County		Attainment/Unclassifiable.
Grant County		Attainment/Unclassifiable.
Hennepin County		Attainment/Unclassifiable.
Houston County		Attainment/Unclassifiable.
Hubbard County		Attainment/Unclassifiable.
Isanti County		Attainment/Unclassifiable.
Itasca County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Kanabec County		Attainment/Unclassifiable.
Kandiyohi County		Attainment/Unclassifiable.
Kittson County		Attainment/Unclassifiable.
Koochiching County		Attainment/Unclassifiable.
Lac qui Parle County		Attainment/Unclassifiable.
Lake County		Attainment/Unclassifiable.
Lake of the Woods County		Attainment/Unclassifiable.
Le Sueur County		Attainment/Unclassifiable.
Lincoln County		Attainment/Unclassifiable.
Lyon County		Attainment/Unclassifiable.
McLeod County		Attainment/Unclassifiable.
Mahnomen County		Attainment/Unclassifiable.
Marshall County		Attainment/Unclassifiable.
Martin County		Attainment/Unclassifiable.
Meeker County		Attainment/Unclassifiable.
Mille Lacs County		Attainment/Unclassifiable.
Morrison County		Attainment/Unclassifiable.
Mower County		Attainment/Unclassifiable.
Murray County		Attainment/Unclassifiable.
Nicollet County		Attainment/Unclassifiable.
Nobles County		Attainment/Unclassifiable.
Norman County		Attainment/Unclassifiable.
Olmsted County		Attainment/Unclassifiable.
Otter Tail County		Attainment/Unclassifiable.
Pennington County		Attainment/Unclassifiable.
Pine County		Attainment/Unclassifiable.
Pipestone County		Attainment/Unclassifiable.
Polk County		Attainment/Unclassifiable.
Pope County		Attainment/Unclassifiable.
Ramsey County		Attainment/Unclassifiable.
Red Lake County		Attainment/Unclassifiable.
Redwood County		Attainment/Unclassifiable.
Renville County		Attainment/Unclassifiable.
Rice County		Attainment/Unclassifiable.
Rock County		Attainment/Unclassifiable.
Roseau County		Attainment/Unclassifiable.
St. Louis County		Attainment/Unclassifiable.
Scott County		Attainment/Unclassifiable.
Sherburne County		Attainment/Unclassifiable.
Sibley County		Attainment/Unclassifiable.
Stearns County		Attainment/Unclassifiable.
Steele County		Attainment/Unclassifiable.
Stevens County		Attainment/Unclassifiable.
Swift County		Attainment/Unclassifiable.
Todd County		Attainment/Unclassifiable.
Traverse County		Attainment/Unclassifiable.
Wabasha County		Attainment/Unclassifiable.
Wadena County		Attainment/Unclassifiable.
Waseca County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Watonwan County		Attainment/Unclassifiable.
Wilkin County		Attainment/Unclassifiable.
Winona County		Attainment/Unclassifiable.
Wright County		Attainment/Unclassifiable.
Yellow Medicine County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

26. Section 81.325 is amended by revising the table entitled “Mississippi—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.325

Mississippi.

* * * * *

Mississippi—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Adams County		Attainment/Unclassifiable.
Alcorn County		Attainment/Unclassifiable.
Amite County		Attainment/Unclassifiable.
Attala County		Attainment/Unclassifiable.
Benton County		Attainment/Unclassifiable.
Bolivar County		Attainment/Unclassifiable.
Calhoun County		Attainment/Unclassifiable.
Carroll County		Attainment/Unclassifiable.
Chickasaw County		Attainment/Unclassifiable.
Choctaw County		Attainment/Unclassifiable.
Claiborne County		Attainment/Unclassifiable.
Clarke County		Attainment/Unclassifiable.
Clay County		Attainment/Unclassifiable.
Coahoma County		Attainment/Unclassifiable.
Copiah County		Attainment/Unclassifiable.
Covington County		Attainment/Unclassifiable.
DeSoto County		Attainment/Unclassifiable.
Forrest County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
George County		Attainment/Unclassifiable.
Greene County		Attainment/Unclassifiable.
Grenada County		Attainment/Unclassifiable.
Hancock County		Attainment/Unclassifiable.
Harrison County		Attainment/Unclassifiable.
Hinds County		Attainment/Unclassifiable.
Holmes County		Attainment/Unclassifiable.
Humphreys County		Attainment/Unclassifiable.
Issaquena County		Attainment/Unclassifiable.
Itawamba County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jasper County		Attainment/Unclassifiable.
Jefferson County		Attainment/Unclassifiable.
Jefferson Davis County		Attainment/Unclassifiable.
Jones County		Attainment/Unclassifiable.
Kemper County		Attainment/Unclassifiable.
Lafayette County		Attainment/Unclassifiable.
Lamar County, MS	9/12/16	Attainment/Unclassifiable.
Lauderdale County		Attainment/Unclassifiable.
Lawrence County		Attainment/Unclassifiable.
Leake County		Attainment/Unclassifiable.
Lee County		Attainment/Unclassifiable.
Leflore County		Attainment/Unclassifiable.
Lincoln County		Attainment/Unclassifiable.
Lowndes County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Marion County		Attainment/Unclassifiable.
Marshall County		Attainment/Unclassifiable.
Monroe County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Neshoba County		Attainment/Unclassifiable.
Newton County		Attainment/Unclassifiable.
Noxubee County		Attainment/Unclassifiable.
Oktibbeha County		Attainment/Unclassifiable.
Panola County		Attainment/Unclassifiable.
Pearl River County		Attainment/Unclassifiable.
Perry County		Attainment/Unclassifiable.
Pike County		Attainment/Unclassifiable.
Pontotoc County		Attainment/Unclassifiable.
Prentiss County		Attainment/Unclassifiable.
Quitman County		Attainment/Unclassifiable.
Rankin County		Attainment/Unclassifiable.
Scott County		Attainment/Unclassifiable.
Sharkey County		Attainment/Unclassifiable.
Simpson County		Attainment/Unclassifiable.
Smith County		Attainment/Unclassifiable.
Stone County		Attainment/Unclassifiable.
Sunflower County		Attainment/Unclassifiable.
Tallahatchie County		Attainment/Unclassifiable.
Tate County		Attainment/Unclassifiable.
Tippah County		Attainment/Unclassifiable.
Tishomingo County		Attainment/Unclassifiable.
Tunica County		Attainment/Unclassifiable.
Union County		Attainment/Unclassifiable.
Walthall County		Attainment/Unclassifiable.
Warren County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Wayne County		Attainment/Unclassifiable.
Webster County		Attainment/Unclassifiable.
Wilkinson County		Attainment/Unclassifiable.
Winston County		Attainment/Unclassifiable.
Yalobusha County		Attainment/Unclassifiable.
Yazoo County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

27. Section 81.326 is amended by revising the table entitled “Missouri—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.326

Missouri.

* * * * *

Missouri—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Jackson County, MO	10/4/13	Nonattainment.
Jackson County (part)
The portion of Jackson County bounded by I-70/I-670 and the Missouri River to the north; and, to the west of I-435 to the state line separating Missouri and Kansas.
Jefferson County, MO	10/4/13	Nonattainment.
Jefferson County (part)
That portion within Jefferson County described by connecting the following four sets of UTM coordinates moving in a clockwise manner:
(Herculaneum USGS Quadrangle) 718360.283 4250477.056 729301.869 4250718.415 729704.134 4236840.30 718762.547 4236558.715
(Festus USGS Quadrangle) 718762.547 4236558.715 729704.134 4236840.30 730066.171 4223042.637 719124.585 4222680.6
(Selma USGS Quadrangle) 729704.134 4236840.30 730428.209 4236840.3 741047.984 4223283.996 730066.171 4223042.637
(Valmeyer USGS Quadrangle) 729301.869 4250718.415 731474.096 4250798.868 730428.209 4236840.3 729704.134 4236840.30
Franklin-St. Charles Counties, MO	9/12/16	Unclassifiable.
Franklin County (part)
The eastern and western boundaries are Boles Township boundaries. The northern boundary is the Franklin County-St. Charles County Line. The southern boundary is Interstate 44.
St. Charles County (part)
The eastern and western boundaries are Boone Township boundaries. The northern boundary is Missouri Route D and Highway 94. The southern boundary is the Franklin County-St. Charles County Line.
Jackson County, MO	9/12/16	Unclassifiable.
Jackson County (part)
The northern boundary is the county line separating Jackson County from Clay and Ray Counties. The eastern boundary is the county line separating Jackson County from Lafayette County. The southern boundary is Interstates 70 and 470. The western boundary is Missouri Highway 291.
Adair County		Attainment/Unclassifiable.
Andrew County		Attainment/Unclassifiable.
Atchison County		Attainment/Unclassifiable.
Audrain County		Attainment/Unclassifiable.
Barry County		Attainment/Unclassifiable.
Barton County		Attainment/Unclassifiable.
Bates County		Attainment/Unclassifiable.
Benton County		Attainment/Unclassifiable.
Bollinger County		Attainment/Unclassifiable.
Boone County		Attainment/Unclassifiable.
Buchanan County		Attainment/Unclassifiable.
Butler County		Attainment/Unclassifiable.
Caldwell County		Attainment/Unclassifiable.
Callaway County		Attainment/Unclassifiable.
Camden County		Attainment/Unclassifiable.
Cape Girardeau County		Attainment/Unclassifiable.
Carroll County		Attainment/Unclassifiable.
Carter County		Attainment/Unclassifiable.
Cass County		Attainment/Unclassifiable.
Cedar County		Attainment/Unclassifiable.
Chariton County		Attainment/Unclassifiable.
Christian County		Attainment/Unclassifiable.
Clark County		Attainment/Unclassifiable.
Clay County		Attainment/Unclassifiable.
Clinton County		Attainment/Unclassifiable.
Cole County		Attainment/Unclassifiable.
Cooper County		Attainment/Unclassifiable.
Crawford County		Attainment/Unclassifiable.
Dade County		Attainment/Unclassifiable.
Dallas County		Attainment/Unclassifiable.
Daviess County		Attainment/Unclassifiable.
DeKalb County		Attainment/Unclassifiable.
Dent County		Attainment/Unclassifiable.
Douglas County		Attainment/Unclassifiable.
Dunklin County		Attainment/Unclassifiable.
Franklin County (part) (remainder)		Attainment/Unclassifiable.
Gasconade County		Attainment/Unclassifiable.
Gentry County		Attainment/Unclassifiable.
Greene County		Attainment/Unclassifiable.
Grundy County		Attainment/Unclassifiable.
Harrison County		Attainment/Unclassifiable.
Henry County		Attainment/Unclassifiable.
Hickory County		Attainment/Unclassifiable.
Holt County		Attainment/Unclassifiable.
Howard County		Attainment/Unclassifiable.
Howell County		Attainment/Unclassifiable.
Jackson County (part) (remainder)		Attainment/Unclassifiable.
Jasper County		Attainment/Unclassifiable.
Jefferson County (part) (remainder)		Attainment/Unclassifiable.
Johnson County		Attainment/Unclassifiable.
Knox County		Attainment/Unclassifiable.
Laclede County		Attainment/Unclassifiable.
Lafayette County		Attainment/Unclassifiable.
Lawrence County		Attainment/Unclassifiable.
Lewis County		Attainment/Unclassifiable.
Lincoln County		Attainment/Unclassifiable.
Linn County		Attainment/Unclassifiable.
Livingston County		Attainment/Unclassifiable.
Macon County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Maries County		Attainment/Unclassifiable.
Marion County		Attainment/Unclassifiable.
McDonald County		Attainment/Unclassifiable.
Mercer County		Attainment/Unclassifiable.
Miller County		Attainment/Unclassifiable.
Mississippi County		Attainment/Unclassifiable.
Moniteau County		Attainment/Unclassifiable.
Monroe County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Morgan County		Attainment/Unclassifiable.
Newton County		Attainment/Unclassifiable.
Nodaway County		Attainment/Unclassifiable.
Oregon County		Attainment/Unclassifiable.
Osage County		Attainment/Unclassifiable.
Ozark County		Attainment/Unclassifiable.
Pemiscot County		Attainment/Unclassifiable.
Perry County		Attainment/Unclassifiable.
Pettis County		Attainment/Unclassifiable.
Phelps County		Attainment/Unclassifiable.
Pike County		Attainment/Unclassifiable.
Platte County		Attainment/Unclassifiable.
Polk County		Attainment/Unclassifiable.
Pulaski County		Attainment/Unclassifiable.
Putnam County		Attainment/Unclassifiable.
Ralls County		Attainment/Unclassifiable.
Randolph County		Attainment/Unclassifiable.
Ray County		Attainment/Unclassifiable.
Reynolds County		Attainment/Unclassifiable.
Ripley County		Attainment/Unclassifiable.
St. Charles County (part) (remainder)		Attainment/Unclassifiable.
St. Clair County		Attainment/Unclassifiable.
St. Francois County		Attainment/Unclassifiable.
Ste. Genevieve County		Attainment/Unclassifiable.
St. Louis City		Attainment/Unclassifiable.
St. Louis County		Attainment/Unclassifiable.
Saline County		Attainment/Unclassifiable.
Schuyler County		Attainment/Unclassifiable.
Scotland County		Attainment/Unclassifiable.
Scott County	9/12/16	Attainment/Unclassifiable.
Shannon County		Attainment/Unclassifiable.
Shelby County		Attainment/Unclassifiable.
Stoddard County		Attainment/Unclassifiable.
Stone County		Attainment/Unclassifiable.
Sullivan County		Attainment/Unclassifiable.
Taney County		Attainment/Unclassifiable.
Texas County		Attainment/Unclassifiable.
Vernon County		Attainment/Unclassifiable.
Warren County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Wayne County		Attainment/Unclassifiable.
Webster County		Attainment/Unclassifiable.
Worth County		Attainment/Unclassifiable.
Wright County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Iron and New Madrid Counties will be designated by December 31, 2020.

* * * * *

28. Section 81.327 is amended by revising the table titled “Montana—2010 Sulfur Dioxide NAAQS (Primary) to read as follows:

§ 81.327

Montana.

* * * * *

Montana—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Yellowstone County (part)	5/10/16	Attainment.
The area originates at the point defined as the southwest corner of Section 11, Township 1S, Range 26E. From that point the boundary proceeds north along the western section line of Section 11 to the point of intersection with the midline of Interstate Highway 90. From that point the boundary follows the midline of Interstate Highway 90, across the Yellowstone River, to the point where the highway midline intersects the northern boundary of Section 35, Township 1N, Range 26E. From that point the boundary proceeds east along the northern section line of Sections 35 and 36 to the point where Old US 87/Hardin Road leaves the section line and turns southeast. The boundary follows the midline of Old US 87/Hardin Road southeast to the point where the road intersects the western boundary of the SE 1/4 of the SE 1/4 of Section 31, Township 1N, Range 27E. From that point the boundary proceeds south along the 1/4 section line to the southern boundary of Township 1N, then east to the northeast corner of Section 5, Township 1S, Range 27E. The boundary then proceeds south along the eastern section line of sections 5 and 8 to the southeast corner of Section 8, Township 1S, Range 27E, where it turns west and follows the south section line of Sections 8 and 7, Township 1S, Range 27E; and Sections 12 and 11, Township 1S, Range 26E, back to the point of origin
Beaverhead County		Attainment/Unclassifiable.
Big Horn County		Attainment/Unclassifiable.
Blaine County		Attainment/Unclassifiable.
Broadwater County		Attainment/Unclassifiable.
Carbon County		Attainment/Unclassifiable.
Carter County		Attainment/Unclassifiable.
Cascade County		Attainment/Unclassifiable.
Chouteau County		Attainment/Unclassifiable.
Custer County		Attainment/Unclassifiable.
Daniels County		Attainment/Unclassifiable.
Dawson County		Attainment/Unclassifiable.
Deer Lodge County		Attainment/Unclassifiable.
Fallon County		Attainment/Unclassifiable.
Fergus County		Attainment/Unclassifiable.
Flathead County		Attainment/Unclassifiable.
Gallatin County		Attainment/Unclassifiable.
Garfield County		Attainment/Unclassifiable.
Glacier County		Attainment/Unclassifiable.
Golden Valley County		Attainment/Unclassifiable.
Granite County		Attainment/Unclassifiable.
Hill County		Attainment/Unclassifiable.
Jefferson County		Attainment/Unclassifiable.
Judith Basin County		Attainment/Unclassifiable.
Lake County		Attainment/Unclassifiable.
Lewis and Clark County		Attainment/Unclassifiable.
Liberty County		Attainment/Unclassifiable.
Lincoln County		Attainment/Unclassifiable.
McCone County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Meagher County		Attainment/Unclassifiable.
Mineral County		Attainment/Unclassifiable.
Missoula County		Attainment/Unclassifiable.
Musselshell County		Attainment/Unclassifiable.
Park County		Attainment/Unclassifiable.
Petroleum County		Attainment/Unclassifiable.
Phillips County		Attainment/Unclassifiable.
Pondera County		Attainment/Unclassifiable.
Powder River County		Attainment/Unclassifiable.
Powell County		Attainment/Unclassifiable.
Prairie County		Attainment/Unclassifiable.
Ravalli County		Attainment/Unclassifiable.
Richland County		Attainment/Unclassifiable.
Roosevelt County		Attainment/Unclassifiable.
Rosebud County		Attainment/Unclassifiable.
Sanders County		Attainment/Unclassifiable.
Sheridan County		Attainment/Unclassifiable.
Silver Bow County		Attainment/Unclassifiable.
Stillwater County		Attainment/Unclassifiable.
Sweet Grass County		Attainment/Unclassifiable.
Teton County		Attainment/Unclassifiable.
Toole County		Attainment/Unclassifiable.
Treasure County		Attainment/Unclassifiable.
Valley County		Attainment/Unclassifiable.
Wheatland County		Attainment/Unclassifiable.
Wibaux County		Attainment/Unclassifiable.
Yellowstone County (part) (remainder)		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

29. Section 81.328 is amended by revising the table entitled “Nebraska—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.328

Nebraska.

* * * * *

Nebraska—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Lancaster County	9/12/16	Unclassifiable.
Statewide:		Attainment/Unclassifiable.
Adams County
Antelope County
Arthur County
Banner County
Blaine County
Boone County
Box Butte County
Boyd County
Brown County
Buffalo County
Burt County
Butler County
Cass County
Cedar County
Chase County
Cherry County
Cheyenne County
Clay County
Colfax County
Cuming County
Custer County
Dakota County
Dawes County
Dawson County
Deuel County
Dixon County
Dodge County
Dundy County
Fillmore County
Franklin County
Frontier County
Furnas County
Gage County
Garden County
Garfield County
Gosper County
Grant County
Greeley County
Hall County
Hamilton County
Harlan County
Hayes County
Hitchcock County
Holt County
Hooker County
Howard County
Jefferson County
Johnson County
Kearney County
Keith County
Keya Paha County
Kimball County
Knox County
Lincoln County	9/12/16	Attainment/Unclassifiable.
Logan County
Loup County
Madison County
McPherson County
Merrick County
Morrill County
Nance County
Nemaha County
Nuckolls County
Otoe County	9/12/16	Attainment/Unclassifiable.
Pawnee County
Perkins County
Phelps County
Pierce County
Platte County
Polk County
Red Willow County
Richardson County
Rock County
Saline County
Sarpy County
Saunders County
Scotts Bluff County
Seward County
Sheridan County
Sherman County
Sioux County
Stanton County
Thayer County
Thomas County
Thurston County
Valley County
Washington County
Wayne County
Webster County
Wheeler County
York County
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Douglas County will be designated by December 31, 2020.

* * * * *

30. Section 81.329 is amended by adding a table entitled “Nevada—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Nevada—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.329

Nevada.

* * * * *

Nevada—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
State of Nevada 3		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Rest of State refers to hydrographic areas as shown on the State of Nevada Division of Water Resources' map titled “Water Resources and Inter-basin Flows” (September 1971), as revised to include a division of Carson Desert (area 101) into two areas, a smaller area 101 and area 101A, and a division of Boulder Flat (area 61) into an Upper Unit 61 and a Lower Unit 61. See also 67 FR 12474 (March 19, 2002).

* * * * *

31. Section 81.330 is amended by revising the table entitled “New Hampshire—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.330

New Hampshire.

* * * * *

New Hampshire—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Central New Hampshire, NH	10/4/13	Nonattainment.
Hillsborough County (part)
Goffstown Town
Merrimack County (part)
Allenstown Town, Bow Town, Chichester Town, Dunbarton Town, Epsom Town, Hooksett Town, Loudon Town, Pembroke Town, Pittsfield Town, City of Concord
Rockingham County (part)
Candia Town, Deerfield Town, Northwood Town
Rest of State:
Belknap County		Attainment/Unclassifiable.
Carroll County		Attainment/Unclassifiable.
Cheshire County		Attainment/Unclassifiable.
Coos County		Attainment/Unclassifiable.
Grafton County		Attainment/Unclassifiable.
Hillsborough County (part)		Attainment/Unclassifiable.
Amherst Town, Antrim Town, Bedford Town, Bennington Town, Brookline Town, Deering Town, Francestown Town, Greenfield Town, Greenville Town, Hancock Town, Hillsborough Town, Hollis Town, Hudson Town, Litchfield Town, Lyndeborough Town, City of Manchester, Mason Town, Merrimack Town, Milford Town, Mont Vernon Town, City of Nashua, New Boston Town, New Ipswich Town, Pelham Town, Peterborough Town, Sharon Town, Temple Town, Weare Town, Wilton Town, Windsor Town
Merrimack County (part)		Attainment/Unclassifiable.
Andover Town, Boscawen Town, Bradford Town, Canterbury Town, Danbury Town, City of Franklin, Henniker Town, Hill Town, Hopkinton Town, New London Town, Newbury Town, Northfield Town, Salisbury Town, Sutton Town, Warner Town, Webster Town, Wilmot Town
Rockingham County (part)		Attainment/Unclassifiable.
Atkinson Town, Auburn Town, Brentwood Town, Chester Town, Danville Town, Derry Town, East Kingston Town, Epping Town, Exeter Town, Fremont Town, Greenland Town, Hampstead Town, Hampton Town, Hampton Falls Town, Kensington Town, Kingston Town, Londonderry Town, New Castle Town, Newfields Town, Newington Town, Newmarket Town, Newton Town, North Hampton Town, Nottingham Town, Plainstow Town, City of Portsmouth, Raymond Town, Rye Town, Salem Town, Sandown Town, Seabrook Town, South Hampton Town, Stratham Town, Windham Town
Strafford County		Attainment/Unclassifiable.
Sullivan County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

32. Section 81.331 is amended by adding a table entitled “New Jersey—2010 Sulfur Dioxide NAAQS (Primary)” following the table “New Jersey—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.331

New Jersey.

* * * * *

New Jersey—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Entire State		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

33. Section 81.332 is amended by adding a table titled “New Mexico—2010 Sulfur Dioxide NAAQS (Primary)” following the table titled “New Mexico—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.332

New Mexico.

* * * * *

New Mexico—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Bernalillo County		Attainment/Unclassifiable.
Catron County		Attainment/Unclassifiable.
Chaves County		Attainment/Unclassifiable.
Cibola County		Attainment/Unclassifiable.
Colfax County		Attainment/Unclassifiable.
Curry County		Attainment/Unclassifiable.
De Baca County		Attainment/Unclassifiable.
Dona Ana County		Attainment/Unclassifiable.
Eddy County		Attainment/Unclassifiable.
Grant County		Attainment/Unclassifiable.
Guadalupe County		Attainment/Unclassifiable.
Harding County		Attainment/Unclassifiable.
Hidalgo County		Attainment/Unclassifiable.
Lea County		Attainment/Unclassifiable.
Lincoln County		Attainment/Unclassifiable.
Los Alamos County		Attainment/Unclassifiable.
Luna County		Attainment/Unclassifiable.
McKinley County		Attainment/Unclassifiable.
Mora County		Attainment/Unclassifiable.
Quay County		Attainment/Unclassifiable.
Rio Arriba County		Attainment/Unclassifiable.
Roosevelt County		Attainment/Unclassifiable.
San Juan County		Attainment/Unclassifiable.
San Miguel County		Attainment/Unclassifiable.
Sandoval County		Attainment/Unclassifiable.
Santa Fe County		Attainment/Unclassifiable.
Socorro County		Attainment/Unclassifiable.
Taos County		Attainment/Unclassifiable.
Torrance County		Attainment/Unclassifiable.
Union County		Attainment/Unclassifiable.
Valencia County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country. The lands of the Navajo Nation, including those lands located geographically within New Mexico, are excluded, as they are separately designated under Section 81.303.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

34. Section 81.333 is amended by revising the table entitled “New York—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.333

New York.

* * * * *

New York—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Monroe County		Unclassifiable.
Erie-Niagara, NY	9/12/16	Attainment/Unclassifiable.
Erie County
Niagara County
Albany County		Attainment/Unclassifiable.
Allegany County		Attainment/Unclassifiable.
Broome County		Attainment/Unclassifiable.
Bronx County		Attainment/Unclassifiable.
Cattaraugus County		Attainment/Unclassifiable.
Chautauqua County		Attainment/Unclassifiable.
Chemung County		Attainment/Unclassifiable.
Chenango County		Attainment/Unclassifiable.
Clinton County		Attainment/Unclassifiable.
Columbia County		Attainment/Unclassifiable.
Cortland County		Attainment/Unclassifiable.
Delaware County		Attainment/Unclassifiable.
Dutchess County		Attainment/Unclassifiable.
Essex County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Fulton County		Attainment/Unclassifiable.
Genesee County		Attainment/Unclassifiable.
Greene County		Attainment/Unclassifiable.
Hamilton County		Attainment/Unclassifiable.
Herkimer County		Attainment/Unclassifiable.
Jefferson County		Attainment/Unclassifiable.
Kings County		Attainment/Unclassifiable.
Lewis County		Attainment/Unclassifiable.
Livingston County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Nassau County		Attainment/Unclassifiable.
New York County		Attainment/Unclassifiable.
Oneida County		Attainment/Unclassifiable.
Onondaga County		Attainment/Unclassifiable.
Ontario County		Attainment/Unclassifiable.
Orange County		Attainment/Unclassifiable.
Orleans County		Attainment/Unclassifiable.
Oswego County		Attainment/Unclassifiable.
Otsego County		Attainment/Unclassifiable.
Putnam County		Attainment/Unclassifiable.
Queens County		Attainment/Unclassifiable.
Rensselaer County		Attainment/Unclassifiable.
Richmond County		Attainment/Unclassifiable.
Rockland County		Attainment/Unclassifiable.
Saratoga County		Attainment/Unclassifiable.
Schenectady County		Attainment/Unclassifiable.
Schoharie County		Attainment/Unclassifiable.
Schuyler County		Attainment/Unclassifiable.
Steuben County		Attainment/Unclassifiable.
Suffolk County		Attainment/Unclassifiable.
Sullivan County		Attainment/Unclassifiable.
Tioga County		Attainment/Unclassifiable.
Ulster County		Attainment/Unclassifiable.
Warren County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Wayne County		Attainment/Unclassifiable.
Westchester County		Attainment/Unclassifiable.
Wyoming County		Attainment/Unclassifiable.
Yates County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Cayuga, St. Lawrence, Seneca, and Tompkins Counties will be designated by December 31, 2020.

* * * * *

35. Section 81.334 is amended by revising the table entitled “North Carolina—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.334

North Carolina.

* * * * *

North Carolina—2010 Sulfur Dioxide NAAQS (Primary)

Designated area	Designation
	Date 1	Type
Brunswick County, NC 2	9/12/16	Unclassifiable.
Brunswick County
Lockwood Folly Township, Northwest Township, Shallotte Township, Smithville Township, Town Creek Township, Waccamaw Township
Rest of State: 3
Alamance County		Attainment/Unclassifiable.
Each Individual Township
Alexander County		Attainment/Unclassifiable.
Each Individual Township
Alleghany County		Attainment/Unclassifiable.
Each Individual Township
Anson County		Attainment/Unclassifiable.
Each Individual Township
Ashe County		Attainment/Unclassifiable.
Each Individual Township
Avery County		Attainment/Unclassifiable.
Each Individual Township
Beaufort County		Attainment/Unclassifiable.
Each Individual Township
Bertie County		Attainment/Unclassifiable.
Each Individual Township
Bladen County		Attainment/Unclassifiable.
Each Individual Township
Buncombe County (part) 4		Attainment/Unclassifiable.
All Townships except Limestone Township
Burke County		Attainment/Unclassifiable.
Each Individual Township
Cabarrus County		Attainment/Unclassifiable.
Each Individual Township
Caldwell County		Attainment/Unclassifiable.
Each Individual Township
Camden County		Attainment/Unclassifiable.
Each Individual Township
Carteret County		Attainment/Unclassifiable.
Each Individual Township
Caswell County		Attainment/Unclassifiable.
Each Individual Township
Catawba County		Attainment/Unclassifiable.
Each Individual Township
Chatham County		Attainment/Unclassifiable.
Each Individual Township
Cherokee County		Attainment/Unclassifiable.
Each Individual Township
Chowan County		Attainment/Unclassifiable.
Each Individual Township
Clay County		Attainment/Unclassifiable.
Each Individual Township
Cleveland County		Attainment/Unclassifiable.
Each Individual Township
Columbus County		Attainment/Unclassifiable.
Each Individual Township
Craven County		Attainment/Unclassifiable.
Each Individual Township
Cumberland County		Attainment/Unclassifiable.
Each Individual Township
Currituck County		Attainment/Unclassifiable.
Each Individual Township
Dare County		Attainment/Unclassifiable.
Each Individual Township
Davidson County		Attainment/Unclassifiable.
Each Individual Township
Davie County		Attainment/Unclassifiable.
Each Individual Township
Duplin County		Attainment/Unclassifiable.
Each Individual Township
Durham County		Attainment/Unclassifiable.
Each Individual Township
Edgecombe County		Attainment/Unclassifiable.
Each Individual Township
Forsyth County		Attainment/Unclassifiable.
Each Individual Township
Franklin County		Attainment/Unclassifiable.
Each Individual Township
Gaston County		Attainment/Unclassifiable.
Each Individual Township
Gates County		Attainment/Unclassifiable.
Each Individual Township
Graham County		Attainment/Unclassifiable.
Each Individual Township
Granville County		Attainment/Unclassifiable.
Each Individual Township
Greene County		Attainment/Unclassifiable.
Each Individual Township
Guilford County		Attainment/Unclassifiable.
Each Individual Township
Halifax County		Attainment/Unclassifiable.
Each Individual Township
Harnett County		Attainment/Unclassifiable.
Each Individual Township
Haywood County (part) 4		Attainment/Unclassifiable.
All Townships except Beaverdam Township
Henderson County		Attainment/Unclassifiable.
Each Individual Township
Hertford County		Attainment/Unclassifiable.
Each Individual Township
Hoke County		Attainment/Unclassifiable.
Each Individual Township
Hyde County		Attainment/Unclassifiable.
Each Individual Township
Iredell County		Attainment/Unclassifiable.
Each Individual Township
Jackson County		Attainment/Unclassifiable.
Each Individual Township
Johnston County		Attainment/Unclassifiable.
Each Individual Township
Jones County		Attainment/Unclassifiable.
Each Individual Township
Lee County		Attainment/Unclassifiable.
Each Individual Township
Lenoir County		Attainment/Unclassifiable.
Each Individual Township
Lincoln County		Attainment/Unclassifiable.
Each Individual Township
McDowell County		Attainment/Unclassifiable.
Each Individual Township
Macon County		Attainment/Unclassifiable.
Each Individual Township
Madison County		Attainment/Unclassifiable.
Each Individual Township
Martin County		Attainment/Unclassifiable.
Each Individual Township
Mecklenburg County		Attainment/Unclassifiable.
Each Individual Township
Mitchell County		Attainment/Unclassifiable.
Each Individual Township
Montgomery County		Attainment/Unclassifiable.
Each Individual Township
Moore County		Attainment/Unclassifiable.
Each Individual Township
Nash County		Attainment/Unclassifiable.
Each Individual Township
New Hanover County		Attainment/Unclassifiable.
Each Individual Township
Northampton County		Attainment/Unclassifiable.
Each Individual Township
Onslow County		Attainment/Unclassifiable.
Each Individual Township
Orange County		Attainment/Unclassifiable.
Each Individual Township
Pamlico County		Attainment/Unclassifiable.
Each Individual Township
Pasquotank County		Attainment/Unclassifiable.
Each Individual Township
Pender County		Attainment/Unclassifiable.
Each Individual Township
Perquimans County		Attainment/Unclassifiable.
Each Individual Township
Person County (part) 4		Attainment/Unclassifiable.
All Townships except Cunningham Township
Pitt County		Attainment/Unclassifiable.
Each Individual Township
Polk County		Attainment/Unclassifiable.
Each Individual Township
Randolph County		Attainment/Unclassifiable.
Each Individual Township
Richmond County		Attainment/Unclassifiable.
Each Individual Township
Robeson County		Attainment/Unclassifiable.
Each Individual Township
Rockingham County		Attainment/Unclassifiable.
Each Individual Township
Rowan County		Attainment/Unclassifiable.
Each Individual Township
Rutherford County		Attainment/Unclassifiable.
Each Individual Township
Sampson County		Attainment/Unclassifiable.
Each Individual Township
Scotland County		Attainment/Unclassifiable.
Each Individual Township
Stanly County		Attainment/Unclassifiable.
Each Individual Township
Stokes County		Attainment/Unclassifiable.
Each Individual Township
Surry County		Attainment/Unclassifiable.
Each Individual Township
Swain County		Attainment/Unclassifiable.
Each Individual Township
Transylvania County		Attainment/Unclassifiable.
Each Individual Township
Tyrrell County		Attainment/Unclassifiable.
Each Individual Township
Union County		Attainment/Unclassifiable.
Each Individual Township
Vance County		Attainment/Unclassifiable.
Each Individual Township
Wake County		Attainment/Unclassifiable.
Each Individual Township
Warren County		Attainment/Unclassifiable.
Each Individual Township
Washington County		Attainment/Unclassifiable.
Each Individual Township
Watauga County		Attainment/Unclassifiable.
Each Individual Township
Wayne County		Attainment/Unclassifiable.
Each Individual Township
Wilkes County		Attainment/Unclassifiable.
Each Individual Township
Wilson County		Attainment/Unclassifiable.
Each Individual Township
Yadkin County		Attainment/Unclassifiable.
Each Individual Township
Yancey County		Attainment/Unclassifiable.
Each Individual Township
1 This date is April 9, 2018, unless otherwise noted.
2 Excludes Indian country located in each area, if any, unless otherwise specified.
3 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
4 The remaining portions of Buncombe, Haywood, and Person Counties will be designated by December 31, 2020.

* * * * *

36. Section 81.335 is amended by revising the table entitled “North Dakota—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.335

North Dakota.

* * * * *

North Dakota—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
McLean County/Eastern Mercer County, ND	9/12/16	Attainment/Unclassifiable.
McLean County
Mercer County (part)
Area east of CR-37/ND 31, east/north of ND 200 ALT, west of the eastern border of Mercer County/Missouri River, south of the Knife River National Historic Site.
Central Mercer County, ND	9/12/16	Attainment/Unclassifiable.
Mercer County (part)
Area west of ND 49/61st Ave SW, north of Co. Rd 15/17th St. SW, east of Co. Rd 13, south and east of the town Zap, south of 8th St. SW/ND 200
Rest of State: 3		Attainment/Unclassifiable.
Adams County
Barnes County
Benson County
Billings County
Bottineau County
Bowman County
Burke County
Burleigh County
Cass County
Cavalier County
Dickey County
Divide County
Dunn County
Eddy County
Emmons County
Foster County
Golden Valley County
Grand Forks County
Grant County
Griggs County
Hettinger County
Kidder County
LaMoure County
Logan County
McHenry County
McIntosh County
McKenzie County
Mercer County (part) (remainder)
Morton County
Mountrail County
Nelson County
Oliver County
Pembina County
Pierce County
Ramsey County
Ransom County
Renville County
Richland County
Rolette County
Sargent County
Sheridan County
Sioux County
Slope County
Stark County
Steele County
Stutsman County
Towner County
Traill County
Walsh County
Ward County
Wells County
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Williams County will be designated by December 31, 2020.

* * * * *

37. Section 81.336 is amended by revising the table entitled “Ohio—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.336

Ohio.

* * * * *

Ohio—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Campbell-Clermont Counties, KY-OH	11/21/16	Attainment.
Clermont County (part)
Pierce Township
Lake County, OH	10/4/13	Nonattainment.
Lake County
Muskingum River, OH	10/4/13	Nonattainment.
Morgan County (part)
Center Township
Washington County (part)
Waterford Township
Steubenville, OH-WV	10/4/13	Nonattainment.
Jefferson County (part)
Cross Creek Township, Steubenville Township, Warren Township, Wells Township, Steubenville City
Gallia County, OH	9/12/16	Unclassifiable.
Gallia County
Meigs County (part)
Bedford, Columbia, Rutland, Salem, Salisbury, and Scipio Townships
Clermont County, Ohio 2	9/12/16	Attainment/Unclassifiable.
Clermont County (part)
Clermont County excluding Pierce Township
Adams County		Attainment/Unclassifiable.
Allen County		Attainment/Unclassifiable.
Ashland County		Attainment/Unclassifiable.
Ashtabula County		Attainment/Unclassifiable.
Athens County		Attainment/Unclassifiable.
Auglaize County		Attainment/Unclassifiable.
Belmont County		Attainment/Unclassifiable.
Brown County		Attainment/Unclassifiable.
Butler County		Attainment/Unclassifiable
Carroll County		Attainment/Unclassifiable.
Champaign County		Attainment/Unclassifiable.
Clark County		Attainment/Unclassifiable.
Clinton County		Attainment/Unclassifiable.
Columbiana County		Attainment/Unclassifiable.
Coshocton County		Attainment/Unclassifiable.
Crawford County		Attainment/Unclassifiable.
Cuyahoga County		Attainment/Unclassifiable.
Darke County		Attainment/Unclassifiable.
Defiance County		Attainment/Unclassifiable.
Delaware County		Attainment/Unclassifiable.
Erie County		Attainment/Unclassifiable.
Fairfield County		Attainment/Unclassifiable.
Fayette County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Fulton County		Attainment/Unclassifiable.
Geauga County		Attainment/Unclassifiable.
Greene County		Attainment/Unclassifiable.
Guernsey County		Attainment/Unclassifiable.
Hamilton County		Attainment/Unclassifiable.
Hancock County		Attainment/Unclassifiable.
Hardin County		Attainment/Unclassifiable.
Harrison County		Attainment/Unclassifiable.
Henry County		Attainment/Unclassifiable.
Highland County		Attainment/Unclassifiable.
Hocking County		Attainment/Unclassifiable.
Holmes County		Attainment/Unclassifiable.
Huron County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jefferson County (part) (remainder)		Attainment/Unclassifiable.
Knox County		Attainment/Unclassifiable.
Lawrence County		Attainment/Unclassifiable.
Licking County		Attainment/Unclassifiable.
Logan County		Attainment/Unclassifiable.
Lorain County		Attainment/Unclassifiable.
Lucas County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Mahoning County		Attainment/Unclassifiable.
Marion County		Attainment/Unclassifiable.
Medina County		Attainment/Unclassifiable.
Meigs County (part) (remainder)		Attainment/Unclassifiable.
Mercer County		Attainment/Unclassifiable.
Miami County		Attainment/Unclassifiable.
Monroe County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Morgan County (part) (remainder)		Attainment/Unclassifiable.
Morrow County		Attainment/Unclassifiable.
Muskingum County		Attainment/Unclassifiable.
Noble County		Attainment/Unclassifiable.
Ottawa County		Attainment/Unclassifiable.
Paulding County		Attainment/Unclassifiable.
Perry County		Attainment/Unclassifiable.
Pickaway County		Attainment/Unclassifiable.
Pike County		Attainment/Unclassifiable.
Portage County		Attainment/Unclassifiable.
Preble County		Attainment/Unclassifiable.
Putnam County		Attainment/Unclassifiable.
Richland County		Attainment/Unclassifiable.
Ross County		Attainment/Unclassifiable.
Sandusky County		Attainment/Unclassifiable.
Scioto County		Attainment/Unclassifiable.
Seneca County		Attainment/Unclassifiable.
Shelby County		Attainment/Unclassifiable.
Stark County		Attainment/Unclassifiable.
Summit County		Attainment/Unclassifiable.
Trumbull County		Attainment/Unclassifiable.
Tuscarawas County		Attainment/Unclassifiable.
Union County		Attainment/Unclassifiable.
Van Wert County		Attainment/Unclassifiable.
Vinton County		Attainment/Unclassifiable.
Warren County		Attainment/Unclassifiable.
Washington County (part) (remainder)		Attainment/Unclassifiable.
Wayne County		Attainment/Unclassifiable.
Williams County		Attainment/Unclassifiable.
Wood County		Attainment/Unclassifiable.
Wyandot County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

38. Section 81.337 is amended by revising the table entitled “Oklahoma—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.337

Oklahoma.

* * * * *

Oklahoma—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Adair County		Attainment/Unclassifiable.
Alfalfa County		Attainment/Unclassifiable.
Atoka County		Attainment/Unclassifiable.
Beaver County		Attainment/Unclassifiable.
Beckham County		Attainment/Unclassifiable.
Blaine County		Attainment/Unclassifiable.
Bryan County		Attainment/Unclassifiable.
Caddo County		Attainment/Unclassifiable.
Canadian County		Attainment/Unclassifiable.
Carter County		Attainment/Unclassifiable.
Cherokee County		Attainment/Unclassifiable.
Choctaw County	9/12/16	Attainment/Unclassifiable.
Cimarron County		Attainment/Unclassifiable.
Cleveland County		Attainment/Unclassifiable.
Coal County		Attainment/Unclassifiable.
Comanche County		Attainment/Unclassifiable.
Cotton County		Attainment/Unclassifiable.
Craig County		Attainment/Unclassifiable.
Creek County		Attainment/Unclassifiable.
Custer County		Attainment/Unclassifiable.
Delaware County		Attainment/Unclassifiable.
Dewey County		Attainment/Unclassifiable.
Ellis County		Attainment/Unclassifiable.
Garvin County		Attainment/Unclassifiable.
Grady County		Attainment/Unclassifiable.
Grant County		Attainment/Unclassifiable.
Greer County		Attainment/Unclassifiable.
Harmon County		Attainment/Unclassifiable.
Harper County		Attainment/Unclassifiable.
Haskell County		Attainment/Unclassifiable.
Hughes County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jefferson County		Attainment/Unclassifiable.
Johnston County		Attainment/Unclassifiable.
Kay County		Attainment/Unclassifiable.
Kingfisher County		Attainment/Unclassifiable.
Kiowa County		Attainment/Unclassifiable.
Latimer County		Attainment/Unclassifiable.
Le Flore County		Attainment/Unclassifiable.
Lincoln County		Attainment/Unclassifiable.
Logan County		Attainment/Unclassifiable.
Love County		Attainment/Unclassifiable.
McClain County		Attainment/Unclassifiable.
McCurtain County		Attainment/Unclassifiable.
McIntosh County		Attainment/Unclassifiable.
Major County		Attainment/Unclassifiable.
Marshall County		Attainment/Unclassifiable.
Murray County		Attainment/Unclassifiable.
Noble County	9/12/16	Attainment/Unclassifiable.
Nowata County		Attainment/Unclassifiable.
Okfuskee County		Attainment/Unclassifiable.
Oklahoma County		Attainment/Unclassifiable.
Okmulgee County		Attainment/Unclassifiable.
Osage County		Attainment/Unclassifiable.
Ottawa County		Attainment/Unclassifiable.
Pawnee County		Attainment/Unclassifiable.
Payne County		Attainment/Unclassifiable.
Pittsburg County		Attainment/Unclassifiable.
Pontotoc County		Attainment/Unclassifiable.
Pottawatomie County		Attainment/Unclassifiable.
Pushmataha County		Attainment/Unclassifiable.
Roger Mills County		Attainment/Unclassifiable.
Rogers County		Attainment/Unclassifiable.
Seminole County		Attainment/Unclassifiable.
Sequoyah County		Attainment/Unclassifiable.
Stephens County		Attainment/Unclassifiable.
Texas County		Attainment/Unclassifiable.
Tillman County		Attainment/Unclassifiable.
Tulsa County		Attainment/Unclassifiable.
Wagoner County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Washita County		Attainment/Unclassifiable.
Woods County		Attainment/Unclassifiable.
Woodward County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Garfield and Mayes Counties will be designated by December 31, 2020.

* * * * *

39. Section 81.338 is amended by adding a table titled “Oregon—2010 Sulfur Dioxide NAAQS (Primary)” following the table titled “Oregon—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.338

Oregon.

* * * * *

Oregon—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Entire State		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

40. Section 81.339 is amended by revising the table entitled “Pennsylvania—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.339

Pennsylvania.

* * * * *

Pennsylvania—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Allegheny, PA
Allegheny County (part)	10/4/13	Nonattainment.
The area consisting of: Borough of Braddock Borough of Dravosburg Borough of East McKeesport Borough of East Pittsburgh Borough of Elizabeth Borough of Glassport Borough of Jefferson Hills Borough of Liberty Borough of Lincoln Borough of North Braddock Borough of Pleasant Hills Borough of Port Vue Borough of Versailles Borough of Wall Borough of West Elizabeth Borough of West Mifflin City of Clairton City of Duquesne City of McKeesport Elizabeth Township Forward Township North Versailles Township
Beaver, PA
Beaver County (part)	10/4/13	Nonattainment.
Area consisting of Industry Borough, Shippingport Borough, Midland Borough, Brighton Township, Potter Township and Vanport Township
Indiana, PA	10/4/13	Nonattainment.
Indiana County
Armstrong County (part)
Area consisting of Plumcreek Township, South Bend Township, and Elderton Borough
Warren, PA
Warren County (part)	10/4/13	Nonattainment.
Area consisting of Conewango Township, Glade Township, Pleasant Township, and the City of Warren
Allegheny (part)		Unclassifiable.
Remainder of County
Cambria County		Unclassifiable.
Carbon-Schuylkill Area		Unclassifiable.
Carbon County
Schuylkill County
Clearfield County		Unclassifiable.
Lawrence County		Unclassifiable.
Lehigh-Northampton Area		Unclassifiable.
Lehigh County
Northampton County
Adams County		Attainment/Unclassifiable.
Armstrong County (part)		Attainment/Unclassifiable.
Remainder of County
Beaver County (part)		Attainment/Unclassifiable.
Remainder of County
Bedford County		Attainment/Unclassifiable.
Berks County		Attainment/Unclassifiable.
Blair County		Attainment/Unclassifiable.
Bradford County		Attainment/Unclassifiable.
Bucks County		Attainment/Unclassifiable.
Butler County		Attainment/Unclassifiable.
Cameron County		Attainment/Unclassifiable.
Centre County		Attainment/Unclassifiable.
Chester County		Attainment/Unclassifiable.
Clarion County		Attainment/Unclassifiable.
Clinton County		Attainment/Unclassifiable.
Columbia County		Attainment/Unclassifiable.
Crawford County		Attainment/Unclassifiable.
Cumberland County		Attainment/Unclassifiable.
Dauphin County		Attainment/Unclassifiable.
Elk County		Attainment/Unclassifiable.
Erie County		Attainment/Unclassifiable.
Fayette County		Attainment/Unclassifiable.
Forest County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Fulton County		Attainment/Unclassifiable.
Greene County		Attainment/Unclassifiable.
Huntingdon County		Attainment/Unclassifiable.
Jefferson County		Attainment/Unclassifiable.
Juniata County		Attainment/Unclassifiable.
Lackawanna County		Attainment/Unclassifiable.
Lancaster County		Attainment/Unclassifiable.
Lebanon County		Attainment/Unclassifiable.
Luzerne County		Attainment/Unclassifiable.
Lycoming County		Attainment/Unclassifiable.
McKean County		Attainment/Unclassifiable.
Mercer County		Attainment/Unclassifiable.
Mifflin County		Attainment/Unclassifiable.
Monroe County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Montour County		Attainment/Unclassifiable.
Northumberland County		Attainment/Unclassifiable.
Perry County		Attainment/Unclassifiable.
Philadelphia-Delaware		Attainment/Unclassifiable.
Delaware County
Philadelphia County
Pike County		Attainment/Unclassifiable.
Potter County		Attainment/Unclassifiable.
Snyder County		Attainment/Unclassifiable.
Somerset County		Attainment/Unclassifiable.
Sullivan County		Attainment/Unclassifiable.
Susquehanna County		Attainment/Unclassifiable.
Tioga County		Attainment/Unclassifiable.
Union County		Attainment/Unclassifiable.
Venango County		Attainment/Unclassifiable.
Warren County (part)		Attainment/Unclassifiable.
Remainder of County
Washington County		Attainment/Unclassifiable.
Wayne County		Attainment/Unclassifiable.
Westmoreland County		Attainment/Unclassifiable.
Wyoming County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 York County will be designated by December 31, 2020.

* * * * *

41. Section 81.340 is amended by adding a table titled “Rhode Island —2010 Sulfur Dioxide NAAQS (Primary)” following the table titled “Rhode Island —1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.340

Rhode Island.

* * * * *

Rhode Island—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
State of Rhode Island		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

42. Section 81.341 is amended by adding a new table titled “South Carolina—2010 Sulfur Dioxide NAAQS (Primary)” following the table titled “South Carolina—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.341

South Carolina.

* * * * *

South Carolina—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Abbeville County		Attainment/Unclassifiable.
Aiken County		Attainment/Unclassifiable.
Allendale County		Attainment/Unclassifiable.
Anderson County		Attainment/Unclassifiable.
Bamberg County		Attainment/Unclassifiable.
Barnwell County		Attainment/Unclassifiable.
Beaufort County		Attainment/Unclassifiable.
Berkeley County		Attainment/Unclassifiable.
Calhoun County		Attainment/Unclassifiable.
Charleston County		Attainment/Unclassifiable.
Cherokee County		Attainment/Unclassifiable.
Chester County		Attainment/Unclassifiable.
Chesterfield County		Attainment/Unclassifiable.
Clarendon County		Attainment/Unclassifiable.
Colleton County		Attainment/Unclassifiable.
Darlington County		Attainment/Unclassifiable.
Dillon County		Attainment/Unclassifiable.
Dorchester County		Attainment/Unclassifiable.
Edgefield County		Attainment/Unclassifiable.
Fairfield County		Attainment/Unclassifiable.
Florence County		Attainment/Unclassifiable.
Georgetown County		Attainment/Unclassifiable.
Greenville County		Attainment/Unclassifiable.
Greenwood County		Attainment/Unclassifiable.
Hampton County		Attainment/Unclassifiable.
Horry County		Attainment/Unclassifiable.
Jasper County		Attainment/Unclassifiable.
Kershaw County		Attainment/Unclassifiable.
Lancaster County		Attainment/Unclassifiable.
Laurens County		Attainment/Unclassifiable.
Lee County		Attainment/Unclassifiable.
Lexington County		Attainment/Unclassifiable.
Marion County		Attainment/Unclassifiable.
Marlboro County		Attainment/Unclassifiable.
McCormick County		Attainment/Unclassifiable.
Newberry County		Attainment/Unclassifiable.
Oconee County		Attainment/Unclassifiable.
Orangeburg County		Attainment/Unclassifiable.
Pickens County		Attainment/Unclassifiable.
Richland County		Attainment/Unclassifiable.
Saluda County		Attainment/Unclassifiable.
Spartanburg County		Attainment/Unclassifiable.
Sumter County		Attainment/Unclassifiable.
Union County		Attainment/Unclassifiable.
Williamsburg County		Attainment/Unclassifiable.
York County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

43. Section 81.342 is amended by revising the table entitled “South Dakota—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.342

South Dakota.

* * * * *

South Dakota—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Statewide:		Attainment/Unclassifiable.
Aurora County
Beadle County
Bennett County
Bon Homme County
Brookings County
Brown County
Brule County
Buffalo County
Butte County
Campbell County
Charles Mix County
Clark County
Clay County
Codington County
Corson County
Custer County
Davison County
Day County
Deuel County
Dewey County
Douglas County
Edmunds County
Fall River County
Faulk County
Grant County	9/12/16	Attainment/Unclassifiable.
Gregory County
Haakon County
Hamlin County
Hand County
Hanson County
Harding County
Hughes County
Hutchinson County
Hyde County
Jackson County
Jerauld County
Jones County
Kingsbury County
Lake County
Lawrence County
Lincoln County
Lyman County
McCook County
McPherson County
Marshall County
Meade County
Mellette County
Miner County
Minnehaha County
Moody County
Oglala Lakota County
Pennington County
Perkins County
Potter County
Roberts County
Sanborn County
Spink County
Stanley County
Sully County
Todd County
Tripp County
Turner County
Union County
Walworth County
Yankton County
Ziebach County
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

44. Section 81.343 is amended by revising the table entitled “Tennessee—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.343

Tennessee.

* * * * *

Tennessee—2010 Sulfur Dioxide NAAQS (Primary)

Designated area	Designation
	Date 1	Type
Sullivan County, TN 2	10/4/13	Nonattainment.
Sullivan County (part)
That portion of Sullivan County encompassing a circle having its center at the B-253 power house coordinates 36.5186 N; 82.5350 W and having a 3-kilometer radius
Sumner County, TN 2	9/12/16	Unclassifiable.
Sumner County
Rest of State: 3
Anderson County		Attainment/Unclassifiable.
Bedford County		Attainment/Unclassifiable.
Benton County		Attainment/Unclassifiable.
Bledsoe County		Attainment/Unclassifiable.
Blount County		Attainment/Unclassifiable.
Bradley County		Attainment/Unclassifiable.
Campbell County		Attainment/Unclassifiable.
Cannon County		Attainment/Unclassifiable.
Carroll County		Attainment/Unclassifiable.
Carter County		Attainment/Unclassifiable.
Cheatham County		Attainment/Unclassifiable.
Chester County		Attainment/Unclassifiable.
Claiborne County		Attainment/Unclassifiable.
Clay County		Attainment/Unclassifiable.
Cocke County		Attainment/Unclassifiable.
Coffee County		Attainment/Unclassifiable.
Crockett County		Attainment/Unclassifiable.
Cumberland County		Attainment/Unclassifiable.
Davidson County		Attainment/Unclassifiable.
Decatur County		Attainment/Unclassifiable.
DeKalb County		Attainment/Unclassifiable.
Dickson County		Attainment/Unclassifiable.
Dyer County		Attainment/Unclassifiable.
Fayette County		Attainment/Unclassifiable.
Fentress County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Gibson County		Attainment/Unclassifiable.
Giles County		Attainment/Unclassifiable.
Grainger County		Attainment/Unclassifiable.
Greene County		Attainment/Unclassifiable.
Grundy County		Attainment/Unclassifiable.
Hamblen County		Attainment/Unclassifiable.
Hamilton County		Attainment/Unclassifiable.
Hancock County		Attainment/Unclassifiable.
Hardeman County		Attainment/Unclassifiable.
Hardin County		Attainment/Unclassifiable.
Hawkins County		Attainment/Unclassifiable.
Haywood County		Attainment/Unclassifiable.
Henderson County		Attainment/Unclassifiable.
Henry County		Attainment/Unclassifiable.
Hickman County		Attainment/Unclassifiable.
Houston County		Attainment/Unclassifiable.
Humphreys County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jefferson County		Attainment/Unclassifiable.
Johnson County		Attainment/Unclassifiable.
Knox County		Attainment/Unclassifiable.
Lake County		Attainment/Unclassifiable.
Lauderdale County		Attainment/Unclassifiable.
Lawrence County		Attainment/Unclassifiable.
Lewis County		Attainment/Unclassifiable.
Lincoln County		Attainment/Unclassifiable.
Loudon County		Attainment/Unclassifiable.
Macon County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Marion County		Attainment/Unclassifiable.
Marshall County		Attainment/Unclassifiable.
Maury County		Attainment/Unclassifiable.
McMinn County		Attainment/Unclassifiable.
McNairy County		Attainment/Unclassifiable.
Meigs County		Attainment/Unclassifiable.
Monroe County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Moore County		Attainment/Unclassifiable.
Morgan County		Attainment/Unclassifiable.
Obion County		Attainment/Unclassifiable.
Overton County		Attainment/Unclassifiable.
Perry County		Attainment/Unclassifiable.
Pickett County		Attainment/Unclassifiable.
Polk County		Attainment/Unclassifiable.
Putnam County		Attainment/Unclassifiable.
Rhea County		Attainment/Unclassifiable.
Roane County		Attainment/Unclassifiable.
Robertson County		Attainment/Unclassifiable.
Rutherford County		Attainment/Unclassifiable.
Scott County		Attainment/Unclassifiable.
Sequatchie County		Attainment/Unclassifiable.
Sevier County		Attainment/Unclassifiable.
Shelby County		Attainment/Unclassifiable.
Smith County		Attainment/Unclassifiable.
Stewart County		Attainment/Unclassifiable.
Sullivan County (part) (remainder)		Attainment/Unclassifiable.
Tipton County		Attainment/Unclassifiable.
Trousdale County		Attainment/Unclassifiable.
Unicoi County		Attainment/Unclassifiable.
Union County		Attainment/Unclassifiable.
Van Buren County		Attainment/Unclassifiable.
Warren County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Wayne County		Attainment/Unclassifiable.
Weakley County		Attainment/Unclassifiable.
White County		Attainment/Unclassifiable.
Williamson County		Attainment/Unclassifiable.
Wilson County		Attainment/Unclassifiable.
1 This date is April 9, 2018, unless otherwise noted.
2 Excludes Indian country located in each area, if any, unless otherwise specified.
3 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.

* * * * *

45. Section 81.344 is amended by revising the table entitled “Texas—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.344

Texas.

* * * * *

Texas—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Freestone and Anderson Counties, TX
Freestone County (part) and Anderson County (part)	1/12/17	Nonattainment.
Those portions of Freestone and Anderson Counties encompassed by the rectangle with the vertices using Universal Traverse Mercator (UTM) coordinates in UTM zone 14 with datum NAD83 as follows: (1) Vertices—UTM Easting (m) 766752.69, UTM Northing (m) 3536333.0, (2) vertices—UTM Easting (m) 784752.69, UTM Northing (m) 3536333.0, (3) vertices—UTM Easting (m) 784752.69, UTM Northing (m) 3512333.0, (4) vertices—UTM Easting (m) 766752.69, UTM Northing (m) 3512333.0
Rusk and Panola Counties, TX
Rusk County (part) and Panola County (part)	1/12/17	Nonattainment.
Those portions of Rusk and Panola Counties encompassed by the rectangle with the vertices using Universal Traverse Mercator (UTM) coordinates in UTM zone 15 with datum NAD83 as follows: (1) Vertices—UTM Easting (m) 340067.31, UTM Northing (m) 3575814.75 (2) vertices—UTM Easting (m) 356767.31, UTM Northing (m) 3575814.75 (3) vertices—UTM Easting (m) 356767.31, UTM Northing (m) 3564314.75 (4) vertices—UTM Easting (m) 340067.31, UTM Northing (m) 3564314.75
Titus County (part)	1/12/17	Nonattainment.
That portion of Titus County encompassed by the rectangle with the vertices using Universal Traverse Mercator (UTM) coordinates in UTM zone 15 with datum NAD83 as follows: (1) Vertices—UTM Easting (m) 304329.030, UTM Northing (m) 3666971.0, (2) vertices—UTM Easting (m) 311629.030, UTM Northing (m) 3666971.0, (3) vertices—UTM Easting (m) 311629.03, UTM Northing (m) 3661870.5, (4) vertices—UTM Easting (m) 304329.03, UTM Northing (m) 3661870.5
Milam County, TX	1/12/17	Unclassifiable.
Potter County, TX	9/12/16	Unclassifiable.
Anderson County (part) (remainder)		Attainment/Unclassifiable.
Andrews County		Attainment/Unclassifiable.
Angelina County		Attainment/Unclassifiable.
Aransas County		Attainment/Unclassifiable.
Archer County		Attainment/Unclassifiable.
Armstrong County		Attainment/Unclassifiable.
Atascosa County	9/12/16	Attainment/Unclassifiable.
Austin County		Attainment/Unclassifiable.
Bailey County		Attainment/Unclassifiable.
Bandera County		Attainment/Unclassifiable.
Bastrop County		Attainment/Unclassifiable.
Baylor County		Attainment/Unclassifiable.
Bee County		Attainment/Unclassifiable.
Bell County		Attainment/Unclassifiable.
Blanco County		Attainment/Unclassifiable.
Borden County		Attainment/Unclassifiable.
Bosque County		Attainment/Unclassifiable.
Bowie County		Attainment/Unclassifiable.
Brazoria County		Attainment/Unclassifiable.
Brazos County		Attainment/Unclassifiable.
Brewster County		Attainment/Unclassifiable.
Briscoe County		Attainment/Unclassifiable.
Brooks County		Attainment/Unclassifiable.
Brown County		Attainment/Unclassifiable.
Burleson County		Attainment/Unclassifiable.
Burnet County		Attainment/Unclassifiable.
Caldwell County		Attainment/Unclassifiable.
Calhoun County		Attainment/Unclassifiable.
Callahan County		Attainment/Unclassifiable.
Cameron County		Attainment/Unclassifiable.
Camp County		Attainment/Unclassifiable.
Carson County		Attainment/Unclassifiable.
Cass County		Attainment/Unclassifiable.
Castro County		Attainment/Unclassifiable.
Chambers County		Attainment/Unclassifiable.
Cherokee County		Attainment/Unclassifiable.
Childress County		Attainment/Unclassifiable.
Clay County		Attainment/Unclassifiable.
Cochran County		Attainment/Unclassifiable.
Coke County		Attainment/Unclassifiable.
Coleman County		Attainment/Unclassifiable.
Collin County		Attainment/Unclassifiable.
Collingsworth County		Attainment/Unclassifiable.
Colorado County		Attainment/Unclassifiable.
Comal County		Attainment/Unclassifiable.
Comanche County		Attainment/Unclassifiable.
Concho County		Attainment/Unclassifiable.
Cooke County		Attainment/Unclassifiable.
Coryell County		Attainment/Unclassifiable.
Cottle County		Attainment/Unclassifiable.
Crane County		Attainment/Unclassifiable.
Crockett County		Attainment/Unclassifiable.
Crosby County		Attainment/Unclassifiable.
Culberson County		Attainment/Unclassifiable.
Dallam County		Attainment/Unclassifiable.
Dallas County		Attainment/Unclassifiable.
Dawson County		Attainment/Unclassifiable.
Deaf Smith County		Attainment/Unclassifiable.
Delta County		Attainment/Unclassifiable.
Denton County		Attainment/Unclassifiable.
DeWitt County		Attainment/Unclassifiable.
Dickens County		Attainment/Unclassifiable.
Dimmit County		Attainment/Unclassifiable.
Donley County		Attainment/Unclassifiable.
Duval County		Attainment/Unclassifiable.
Eastland County		Attainment/Unclassifiable.
Ector County		Attainment/Unclassifiable.
Edwards County		Attainment/Unclassifiable.
El Paso County		Attainment/Unclassifiable.
Ellis County		Attainment/Unclassifiable.
Erath County		Attainment/Unclassifiable.
Falls County		Attainment/Unclassifiable.
Fannin County		Attainment/Unclassifiable.
Fayette County		Attainment/Unclassifiable.
Fisher County		Attainment/Unclassifiable.
Floyd County		Attainment/Unclassifiable.
Foard County		Attainment/Unclassifiable.
Fort Bend County	9/12/16	Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Freestone County (part) (remainder)		Attainment/Unclassifiable.
Frio County		Attainment/Unclassifiable.
Gaines County		Attainment/Unclassifiable.
Galveston County		Attainment/Unclassifiable.
Garza County		Attainment/Unclassifiable.
Gillespie County		Attainment/Unclassifiable.
Glasscock County		Attainment/Unclassifiable.
Goliad County	9/12/16	Attainment/Unclassifiable.
Gonzales County		Attainment/Unclassifiable.
Gray County		Attainment/Unclassifiable.
Grayson County		Attainment/Unclassifiable.
Gregg County		Attainment/Unclassifiable.
Grimes County		Attainment/Unclassifiable.
Guadalupe County		Attainment/Unclassifiable.
Hale County		Attainment/Unclassifiable.
Hall County		Attainment/Unclassifiable.
Hamilton County		Attainment/Unclassifiable.
Hansford County		Attainment/Unclassifiable.
Hardeman County		Attainment/Unclassifiable.
Hardin County		Attainment/Unclassifiable.
Harris County		Attainment/Unclassifiable.
Hartley County		Attainment/Unclassifiable.
Haskell County		Attainment/Unclassifiable.
Hays County		Attainment/Unclassifiable.
Hemphill County		Attainment/Unclassifiable.
Henderson County		Attainment/Unclassifiable.
Hidalgo County		Attainment/Unclassifiable.
Hill County		Attainment/Unclassifiable.
Hockley County		Attainment/Unclassifiable.
Hood County		Attainment/Unclassifiable.
Hopkins County		Attainment/Unclassifiable.
Houston County		Attainment/Unclassifiable.
Hudspeth County		Attainment/Unclassifiable.
Hunt County		Attainment/Unclassifiable.
Irion County		Attainment/Unclassifiable.
Jack County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jasper County		Attainment/Unclassifiable.
Jeff Davis County		Attainment/Unclassifiable.
Jim Hogg County		Attainment/Unclassifiable.
Jim Wells County		Attainment/Unclassifiable.
Johnson County		Attainment/Unclassifiable.
Jones County		Attainment/Unclassifiable.
Karnes County		Attainment/Unclassifiable.
Kaufman County		Attainment/Unclassifiable.
Kendall County		Attainment/Unclassifiable.
Kenedy County		Attainment/Unclassifiable.
Kent County		Attainment/Unclassifiable.
Kerr County		Attainment/Unclassifiable.
Kimble County		Attainment/Unclassifiable.
King County		Attainment/Unclassifiable.
Kinney County		Attainment/Unclassifiable.
Kleberg County		Attainment/Unclassifiable.
Knox County		Attainment/Unclassifiable.
Lamar County		Attainment/Unclassifiable.
Lamb County	9/12/16	Attainment/Unclassifiable.
Lampasas County		Attainment/Unclassifiable.
La Salle County		Attainment/Unclassifiable.
Lavaca County		Attainment/Unclassifiable.
Lee County		Attainment/Unclassifiable.
Leon County		Attainment/Unclassifiable.
Liberty County		Attainment/Unclassifiable.
Limestone County	9/12/16	Attainment/Unclassifiable.
Lipscomb County		Attainment/Unclassifiable.
Live Oak County		Attainment/Unclassifiable.
Llano County		Attainment/Unclassifiable.
Loving County		Attainment/Unclassifiable.
Lubbock County		Attainment/Unclassifiable.
Lynn County		Attainment/Unclassifiable.
McCulloch County		Attainment/Unclassifiable.
McLennan County	9/12/16	Attainment/Unclassifiable.
McMullen County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Marion County		Attainment/Unclassifiable.
Martin County		Attainment/Unclassifiable.
Mason County		Attainment/Unclassifiable.
Matagorda County		Attainment/Unclassifiable.
Maverick County		Attainment/Unclassifiable.
Medina County		Attainment/Unclassifiable.
Menard County		Attainment/Unclassifiable.
Midland County		Attainment/Unclassifiable.
Mills County		Attainment/Unclassifiable.
Mitchell County		Attainment/Unclassifiable.
Montague County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Moore County		Attainment/Unclassifiable.
Morris County		Attainment/Unclassifiable.
Motley County		Attainment/Unclassifiable.
Nacogdoches County		Attainment/Unclassifiable.
Newton County		Attainment/Unclassifiable.
Nolan County		Attainment/Unclassifiable.
Nueces County		Attainment/Unclassifiable.
Ochiltree County		Attainment/Unclassifiable.
Oldham County		Attainment/Unclassifiable.
Panola County (part) (remainder)		Attainment/Unclassifiable.
Palo Pinto County		Attainment/Unclassifiable.
Parker County		Attainment/Unclassifiable.
Parmer County		Attainment/Unclassifiable.
Pecos County		Attainment/Unclassifiable.
Polk County		Attainment/Unclassifiable.
Presidio County		Attainment/Unclassifiable.
Rains County		Attainment/Unclassifiable.
Randall County		Attainment/Unclassifiable.
Reagan County		Attainment/Unclassifiable.
Real County		Attainment/Unclassifiable.
Red River County		Attainment/Unclassifiable.
Reeves County		Attainment/Unclassifiable.
Refugio County		Attainment/Unclassifiable.
Roberts County		Attainment/Unclassifiable.
Robertson County	9/12/16	Attainment/Unclassifiable.
Rockwall County		Attainment/Unclassifiable.
Runnels County		Attainment/Unclassifiable.
Rusk County (part) (remainder)		Attainment/Unclassifiable.
Sabine County		Attainment/Unclassifiable.
San Augustine County		Attainment/Unclassifiable.
San Jacinto		Attainment/Unclassifiable.
San Patricio County		Attainment/Unclassifiable.
San Saba County		Attainment/Unclassifiable.
Schleicher County		Attainment/Unclassifiable.
Scurry County		Attainment/Unclassifiable.
Shackelford County		Attainment/Unclassifiable.
Shelby County		Attainment/Unclassifiable.
Sherman County		Attainment/Unclassifiable.
Smith County		Attainment/Unclassifiable.
Somervell County		Attainment/Unclassifiable.
Starr County		Attainment/Unclassifiable.
Stephens County		Attainment/Unclassifiable.
Sterling County		Attainment/Unclassifiable.
Stonewall County		Attainment/Unclassifiable.
Sutton County		Attainment/Unclassifiable.
Swisher County		Attainment/Unclassifiable.
Tarrant County		Attainment/Unclassifiable.
Taylor County		Attainment/Unclassifiable.
Terrell County		Attainment/Unclassifiable.
Terry County		Attainment/Unclassifiable.
Throckmorton County		Attainment/Unclassifiable.
Titus County (part)		Attainment/Unclassifiable.
Tom Green County		Attainment/Unclassifiable.
Travis County		Attainment/Unclassifiable.
Trinity County		Attainment/Unclassifiable.
Tyler County		Attainment/Unclassifiable.
Upshur County		Attainment/Unclassifiable.
Upton County		Attainment/Unclassifiable.
Uvalde County		Attainment/Unclassifiable.
Val Verde County		Attainment/Unclassifiable.
Van Zandt County		Attainment/Unclassifiable.
Victoria County		Attainment/Unclassifiable.
Walker County		Attainment/Unclassifiable.
Waller County		Attainment/Unclassifiable.
Ward County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Webb County		Attainment/Unclassifiable.
Wharton County		Attainment/Unclassifiable.
Wheeler County		Attainment/Unclassifiable.
Wichita County		Attainment/Unclassifiable.
Wilbarger County		Attainment/Unclassifiable.
Willacy County		Attainment/Unclassifiable.
Williamson County		Attainment/Unclassifiable.
Wilson County		Attainment/Unclassifiable.
Winkler County		Attainment/Unclassifiable.
Wise County		Attainment/Unclassifiable.
Wood County		Attainment/Unclassifiable.
Yoakum County		Attainment/Unclassifiable.
Young County		Attainment/Unclassifiable.
Zapata County		Attainment/Unclassifiable.
Zavala County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Bexar, Harrison, Howard, Hutchinson, Jefferson, Navarro, and Orange Counties and the remaining portion of Titus County will be designated by December 31, 2020.

* * * * *

46. Section 81.345 is amended by adding a table titled “Utah—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Utah—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.345

Utah.

* * * * *

Utah—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Statewide:
Beaver County		Attainment/Unclassifiable.
Box Elder County		Attainment/Unclassifiable.
Cache County		Attainment/Unclassifiable.
Carbon County		Attainment/Unclassifiable.
Daggett County		Attainment/Unclassifiable.
Davis County		Attainment/Unclassifiable.
Duchesne County		Attainment/Unclassifiable.
Emery County		Attainment/Unclassifiable.
Garfield County		Attainment/Unclassifiable.
Grand County		Attainment/Unclassifiable.
Iron County		Attainment/Unclassifiable.
Juab County		Attainment/Unclassifiable.
Kane County		Attainment/Unclassifiable.
Millard County		Attainment/Unclassifiable.
Morgan County		Attainment/Unclassifiable.
Piute County		Attainment/Unclassifiable.
Rich County		Attainment/Unclassifiable.
Salt Lake County		Attainment/Unclassifiable.
San Juan County		Attainment/Unclassifiable.
Sanpete County		Attainment/Unclassifiable.
Sevier County		Attainment/Unclassifiable.
Summit County		Attainment/Unclassifiable.
Tooele County		Attainment/Unclassifiable.
Uintah County		Attainment/Unclassifiable.
Utah County		Attainment/Unclassifiable.
Wasatch County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Wayne County		Attainment/Unclassifiable.
Weber County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country. The lands of the Navajo Nation, including those lands located geographically within Utah, are excluded, as they are separately designated under Section 81.303.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

47. Section 81.346 is amended by adding a table titled “Vermont—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Vermont—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.346

Vermont.

* * * * *

Vermont—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Statewide:
Addison		Attainment/Unclassifiable.
Bennington		Attainment/Unclassifiable.
Caledonia		Attainment/Unclassifiable.
Chittenden		Attainment/Unclassifiable.
Essex		Attainment/Unclassifiable.
Franklin		Attainment/Unclassifiable.
Grand Isle		Attainment/Unclassifiable.
Lamoille		Attainment/Unclassifiable.
Orange		Attainment/Unclassifiable.
Orleans		Attainment/Unclassifiable.
Rutland		Attainment/Unclassifiable.
Washington		Attainment/Unclassifiable.
Windham		Attainment/Unclassifiable.
Windsor		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

48. Section 81.347 is amended by adding a table titled “Virginia—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Virginia—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.347

Virginia.

* * * * *

Virginia—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Buchanan County		Unclassifiable.
Accomack County		Attainment/Unclassifiable.
Albemarle County		Attainment/Unclassifiable.
Amelia County		Attainment/Unclassifiable.
Amherst County		Attainment/Unclassifiable.
Appomattox County		Attainment/Unclassifiable.
Arlington County		Attainment/Unclassifiable.
Augusta County		Attainment/Unclassifiable.
Bath County		Attainment/Unclassifiable.
Bedford County		Attainment/Unclassifiable.
Bland County		Attainment/Unclassifiable.
Brunswick County		Attainment/Unclassifiable.
Buckingham County		Attainment/Unclassifiable.
Campbell County		Attainment/Unclassifiable.
Caroline County		Attainment/Unclassifiable.
Carroll County		Attainment/Unclassifiable.
Charles City County		Attainment/Unclassifiable.
Charlotte County		Attainment/Unclassifiable.
Chesterfield County		Attainment/Unclassifiable.
City of Alexandria		Attainment/Unclassifiable.
City of Bedford		Attainment/Unclassifiable.
City of Bristol		Attainment/Unclassifiable.
City of Buena Vista		Attainment/Unclassifiable.
City of Charlottesville		Attainment/Unclassifiable.
City of Chesapeake		Attainment/Unclassifiable.
City of Colonial Heights		Attainment/Unclassifiable.
City of Danville		Attainment/Unclassifiable.
City of Emporia		Attainment/Unclassifiable.
City of Fairfax		Attainment/Unclassifiable.
City of Falls Church		Attainment/Unclassifiable.
City of Franklin		Attainment/Unclassifiable.
City of Fredericksburg		Attainment/Unclassifiable.
City of Galax		Attainment/Unclassifiable.
City of Hampton		Attainment/Unclassifiable.
City of Harrisonburg		Attainment/Unclassifiable.
City of Hopewell		Attainment/Unclassifiable.
City of Lexington		Attainment/Unclassifiable.
City of Lynchburg		Attainment/Unclassifiable.
City of Manassas		Attainment/Unclassifiable.
City of Manassas Park		Attainment/Unclassifiable.
City of Martinsville		Attainment/Unclassifiable.
City of Newport News		Attainment/Unclassifiable.
City of Norfolk		Attainment/Unclassifiable.
City of Norton		Attainment/Unclassifiable.
City of Petersburg		Attainment/Unclassifiable.
City of Poquoson		Attainment/Unclassifiable.
City of Portsmouth		Attainment/Unclassifiable.
City of Radford		Attainment/Unclassifiable.
City of Richmond		Attainment/Unclassifiable.
City of Roanoke		Attainment/Unclassifiable.
City of Salem		Attainment/Unclassifiable.
City of Staunton		Attainment/Unclassifiable.
City of Suffolk		Attainment/Unclassifiable.
City of Virginia Beach		Attainment/Unclassifiable.
City of Waynesboro		Attainment/Unclassifiable.
City of Williamsburg		Attainment/Unclassifiable.
City of Winchester		Attainment/Unclassifiable.
Clarke County		Attainment/Unclassifiable.
Craig County		Attainment/Unclassifiable.
Culpeper County		Attainment/Unclassifiable.
Cumberland County		Attainment/Unclassifiable.
Dickenson County		Attainment/Unclassifiable.
Dinwiddie County		Attainment/Unclassifiable.
Essex County		Attainment/Unclassifiable.
Fairfax County		Attainment/Unclassifiable.
Fauquier County		Attainment/Unclassifiable.
Floyd County		Attainment/Unclassifiable.
Fluvanna County		Attainment/Unclassifiable.
Franklin County		Attainment/Unclassifiable.
Frederick County		Attainment/Unclassifiable.
Gloucester County		Attainment/Unclassifiable.
Goochland County		Attainment/Unclassifiable.
Grayson County		Attainment/Unclassifiable.
Greene County		Attainment/Unclassifiable.
Greensville County		Attainment/Unclassifiable.
Halifax County		Attainment/Unclassifiable.
Hanover County		Attainment/Unclassifiable.
Henrico County		Attainment/Unclassifiable.
Henry County		Attainment/Unclassifiable.
Highland County		Attainment/Unclassifiable.
Isle of Wight County		Attainment/Unclassifiable.
James City County		Attainment/Unclassifiable.
King and Queen County		Attainment/Unclassifiable.
King George County		Attainment/Unclassifiable.
King William County		Attainment/Unclassifiable.
Lancaster County		Attainment/Unclassifiable.
Lee County		Attainment/Unclassifiable.
Loudoun County		Attainment/Unclassifiable.
Louisa County		Attainment/Unclassifiable.
Lunenburg County		Attainment/Unclassifiable.
Madison County		Attainment/Unclassifiable.
Mathews County		Attainment/Unclassifiable.
Mecklenburg County		Attainment/Unclassifiable.
Middlesex County		Attainment/Unclassifiable.
Montgomery County		Attainment/Unclassifiable.
Nelson County		Attainment/Unclassifiable.
New Kent County		Attainment/Unclassifiable.
Northampton County		Attainment/Unclassifiable.
Northumberland County		Attainment/Unclassifiable.
Nottoway County		Attainment/Unclassifiable.
Orange County		Attainment/Unclassifiable.
Page County		Attainment/Unclassifiable.
Patrick County		Attainment/Unclassifiable.
Pittsylvania County		Attainment/Unclassifiable.
Powhatan County		Attainment/Unclassifiable.
Prince Edward County		Attainment/Unclassifiable.
Prince George County		Attainment/Unclassifiable.
Prince William County		Attainment/Unclassifiable.
Pulaski County		Attainment/Unclassifiable.
Rappahannock County		Attainment/Unclassifiable.
Richmond County		Attainment/Unclassifiable.
Roanoke County		Attainment/Unclassifiable.
Rockbridge County		Attainment/Unclassifiable.
Rockingham County		Attainment/Unclassifiable.
Russell County		Attainment/Unclassifiable.
Scott County		Attainment/Unclassifiable.
Shenandoah County		Attainment/Unclassifiable.
Smyth County		Attainment/Unclassifiable.
Southampton County		Attainment/Unclassifiable.
Spotsylvania County		Attainment/Unclassifiable.
Stafford County		Attainment/Unclassifiable.
Surry County		Attainment/Unclassifiable.
Sussex County		Attainment/Unclassifiable.
Tazewell County		Attainment/Unclassifiable.
Warren County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Westmoreland County		Attainment/Unclassifiable.
Wise County		Attainment/Unclassifiable.
Wythe County		Attainment/Unclassifiable.
York County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Alleghany, Botetourt, Covington City, and Giles Counties will be designated by December 31, 2020.

* * * * *

49. Section 81.348 is amended by adding a table titled “Washington—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Washington—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.348

Washington.

* * * * *

Washington—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Lewis County		Unclassifiable.
Thurston County		Unclassifiable.
Rest of State: 3
Adams		Attainment/Unclassifiable.
Asotin		Attainment/Unclassifiable.
Benton		Attainment/Unclassifiable.
Clallam		Attainment/Unclassifiable.
Clark		Attainment/Unclassifiable.
Columbia		Attainment/Unclassifiable.
Cowlitz		Attainment/Unclassifiable.
Ferry		Attainment/Unclassifiable.
Franklin		Attainment/Unclassifiable.
Garfield		Attainment/Unclassifiable.
Grant		Attainment/Unclassifiable.
Grays Harbor		Attainment/Unclassifiable.
Island		Attainment/Unclassifiable.
Jefferson		Attainment/Unclassifiable.
King		Attainment/Unclassifiable.
Kitsap		Attainment/Unclassifiable.
Kittitas		Attainment/Unclassifiable.
Klickitat		Attainment/Unclassifiable.
Lincoln		Attainment/Unclassifiable.
Mason		Attainment/Unclassifiable.
Okanogan		Attainment/Unclassifiable.
Pacific		Attainment/Unclassifiable.
Pend Oreille		Attainment/Unclassifiable.
Pierce		Attainment/Unclassifiable.
San Juan		Attainment/Unclassifiable.
Skagit		Attainment/Unclassifiable.
Skamania		Attainment/Unclassifiable.
Snohomish		Attainment/Unclassifiable.
Spokane		Attainment/Unclassifiable.
Stevens		Attainment/Unclassifiable.
Wahkiakum		Attainment/Unclassifiable.
Walla Walla		Attainment/Unclassifiable.
Whitman		Attainment/Unclassifiable.
Yakima		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Chelan, Douglas, and Whatcom Counties will be designated by December 31, 2020.

* * * * *

50. Section 81.349 is amended by revising the table entitled “West Virginia—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.349

West Virginia.

* * * * *

West Virginia—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 3	Designation
	Date 2	Type
Steubenville, OH-WV
Brooke County (part)	10/4/13	Nonattainment.
Area bounded by the Cross Creek Tax District.
Marshall, WV
Marshall County (part)	10/4/13	Nonattainment.
Area consisting of Clay Tax District, Franklin Tax District, and Washington Tax District.
Wood County		Unclassifiable.
Barbour County		Attainment/Unclassifiable.
Berkeley County		Attainment/Unclassifiable.
Boone County		Attainment/Unclassifiable.
Braxton County		Attainment/Unclassifiable.
Brooke County (part)		Attainment/Unclassifiable.
Area consisting of Buffalo Tax District.
Cabell County		Attainment/Unclassifiable.
Calhoun County		Attainment/Unclassifiable.
Clay County		Attainment/Unclassifiable.
Doddridge County		Attainment/Unclassifiable.
Fayette County		Attainment/Unclassifiable.
Gilmer County		Attainment/Unclassifiable.
Grant County		Attainment/Unclassifiable.
Greenbrier County		Attainment/Unclassifiable.
Hampshire County		Attainment/Unclassifiable.
Hancock County		Attainment/Unclassifiable.
Hardy County		Attainment/Unclassifiable.
Harrison County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jefferson County		Attainment/Unclassifiable.
Kanawha County		Attainment/Unclassifiable.
Lewis County		Attainment/Unclassifiable.
Lincoln County		Attainment/Unclassifiable.
Logan County		Attainment/Unclassifiable.
Marion County		Attainment/Unclassifiable.
Marshall County (part)		Attainment/Unclassifiable.
Area consisting of Cameron Tax District, Liberty Tax District, Meade Tax District, Sand Hill Tax District, Union Tax District, and Webster Tax District.
Mason County		Attainment/Unclassifiable.
McDowell County		Attainment/Unclassifiable.
Mercer County		Attainment/Unclassifiable.
Mingo County		Attainment/Unclassifiable.
Monongalia County		Attainment/Unclassifiable.
Monroe County		Attainment/Unclassifiable.
Morgan County		Attainment/Unclassifiable.
Nicholas County		Attainment/Unclassifiable.
Ohio County		Attainment/Unclassifiable.
Pendleton County		Attainment/Unclassifiable.
Pleasants County		Attainment/Unclassifiable.
Pocahontas County		Attainment/Unclassifiable.
Preston County		Attainment/Unclassifiable.
Putnam County		Attainment/Unclassifiable.
Raleigh County		Attainment/Unclassifiable.
Randolph County		Attainment/Unclassifiable.
Ritchie County		Attainment/Unclassifiable.
Roane County		Attainment/Unclassifiable.
Summers County		Attainment/Unclassifiable.
Taylor County		Attainment/Unclassifiable.
Tucker County		Attainment/Unclassifiable.
Tyler County		Attainment/Unclassifiable.
Upshur County		Attainment/Unclassifiable.
Wayne County		Attainment/Unclassifiable.
Webster County		Attainment/Unclassifiable.
Wetzel County		Attainment/Unclassifiable.
Wirt County		Attainment/Unclassifiable.
Wyoming County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Mineral County will be designated by December 31, 2020.

* * * * *

51. Section 81.350 is amended by revising the table entitled “Wisconsin—2010 Sulfur Dioxide NAAQS (Primary)” to read as follows:

§ 81.350

Wisconsin.

* * * * *

Wisconsin—2010 Sulfur Dioxide NAAQS (Primary)

Designated Area 1 4	Designation
	Date 2	Type
Rhinelander, WI	10/4/13	Nonattainment.
Oneida County (part)
City of Rhinelander, Crescent Town, Newbold Town, Pine Lake Town, and Pelican Town.
Columbia County, WI	9/12/16	Attainment/Unclassifiable.
Columbia County
Adams County		Attainment/Unclassifiable.
Ashland County		Attainment/Unclassifiable.
Barron County		Attainment/Unclassifiable.
Bayfield County		Attainment/Unclassifiable.
Brown County		Attainment/Unclassifiable.
Buffalo County		Attainment/Unclassifiable.
Burnett County		Attainment/Unclassifiable.
Calment County		Attainment/Unclassifiable.
Chippewa County		Attainment/Unclassifiable.
Clark County		Attainment/Unclassifiable.
Crawford County		Attainment/Unclassifiable.
Dane County		Attainment/Unclassifiable.
Dodge County		Attainment/Unclassifiable.
Door County		Attainment/Unclassifiable.
Douglas County		Attainment/Unclassifiable.
Dunn County		Attainment/Unclassifiable.
Eau Claire County		Attainment/Unclassifiable.
Florence County		Attainment/Unclassifiable.
Fond du Lac County		Attainment/Unclassifiable.
Forest County		Attainment/Unclassifiable.
Grant County		Attainment/Unclassifiable.
Green County		Attainment/Unclassifiable.
Green Lake County		Attainment/Unclassifiable.
Iowa County		Attainment/Unclassifiable.
Iron County		Attainment/Unclassifiable.
Jackson County		Attainment/Unclassifiable.
Jefferson County		Attainment/Unclassifiable.
Juneau County		Attainment/Unclassifiable.
Kenosha County		Attainment/Unclassifiable.
Kewaunee County		Attainment/Unclassifiable.
La Crosse County		Attainment/Unclassifiable.
Lafayette County		Attainment/Unclassifiable.
Langlade County		Attainment/Unclassifiable.
Lincoln County		Attainment/Unclassifiable.
Manitowoc County		Attainment/Unclassifiable.
Marathon County		Attainment/Unclassifiable.
Marinette County		Attainment/Unclassifiable.
Marquette County		Attainment/Unclassifiable.
Menominee County		Attainment/Unclassifiable.
Milwaukee County		Attainment/Unclassifiable.
Monroe County		Attainment/Unclassifiable.
Oconto County		Attainment/Unclassifiable.
Oneida County		Attainment/Unclassifiable.
Ozaukee County		Attainment/Unclassifiable.
Pepin County		Attainment/Unclassifiable.
Pierce County		Attainment/Unclassifiable.
Polk County		Attainment/Unclassifiable.
Portage County		Attainment/Unclassifiable.
Price County		Attainment/Unclassifiable.
Racine County		Attainment/Unclassifiable.
Richland County		Attainment/Unclassifiable.
Rock County		Attainment/Unclassifiable.
Rusk County		Attainment/Unclassifiable.
St. Croix County		Attainment/Unclassifiable.
Sauk County		Attainment/Unclassifiable.
Sawyer County		Attainment/Unclassifiable.
Shawano County		Attainment/Unclassifiable.
Sheboygan County		Attainment/Unclassifiable.
Taylor County		Attainment/Unclassifiable.
Trempealeau County		Attainment/Unclassifiable.
Vernon County		Attainment/Unclassifiable.
Vilas County		Attainment/Unclassifiable.
Walworth County		Attainment/Unclassifiable.
Washburn County		Attainment/Unclassifiable.
Washington County		Attainment/Unclassifiable.
Waukesha County		Attainment/Unclassifiable.
Waupaca County		Attainment/Unclassifiable.
Waushara County		Attainment/Unclassifiable.
Winnebago County		Attainment/Unclassifiable.
Wood County		Attainment/Unclassifiable.
Forest County Potawatomi Community Indian Tribe 3		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
3 Includes Indian country of the tribe listed in this table located in Forest County, Wisconsin. Information pertaining to areas of Indian country in this table is intended for Clean Air Act planning purposes only and is not an EPA determination of Indian country status or any Indian country boundary. EPA lacks the authority to establish Indian country land status, and is making no determination of Indian country boundaries, in this table.
4 Outagamie County will be designated by December 31, 2020.

* * * * *

52. Section 81.351 is amended by adding a table titled “Wyoming—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Wyoming—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.351

Wyoming.

* * * * *

Wyoming—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1 2	Designation
	Date 3	Type
Albany County		Attainment/Unclassifiable.
Big Horn County		Attainment/Unclassifiable.
Campbell County		Attainment/Unclassifiable.
Crook County		Attainment/Unclassifiable.
Fremont County (part)		Attainment/Unclassifiable.
All areas west of the western border of Township 40North-Range 93West, T39N-R93W, and T38N-R93W, and south of US Route 20.
Goshen County		Attainment/Unclassifiable.
Hot Springs County		Attainment/Unclassifiable.
Johnson County		Attainment/Unclassifiable.
Lincoln County		Attainment/Unclassifiable.
Natrona County		Attainment/Unclassifiable.
Niobrara County		Attainment/Unclassifiable.
Park County		Attainment/Unclassifiable.
Platte County		Attainment/Unclassifiable.
Sheridan County		Attainment/Unclassifiable.
Sublette County		Attainment/Unclassifiable.
Sweetwater County (part)		Attainment/Unclassifiable.
All areas of the county east of US Route 191.
Teton County		Attainment/Unclassifiable.
Uinta County		Attainment/Unclassifiable.
Washakie County		Attainment/Unclassifiable.
Weston County		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 Carbon and Converse Counties, and the remaining portions of Fremont and Sweetwater Counties, all which will be designated by December 31, 2020.
3 This date is April 9, 2018, unless otherwise noted.

* * * * *

53. Section 81.352 is amended by adding a table titled “American Samoa—2010 Sulfur Dioxide NAAQS (Primary)” following the table “American Samoa—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.352

American Samoa.

* * * * *

American Samoa—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Territory Wide		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

54. Section 81.353 is amended by adding a table titled “Guam—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Guam—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.353

Guam.

* * * * *

Guam—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Piti-Cabras		Nonattainment.
The portion of Guam within a 6.074-km radius centered on UTM Easting 249,601.60 m, and UTM Northing 1,489,602.00 m (UTM Zone 55N).
Rest of Territory		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

55. Section 81.354 is amended by adding a table titled “Northern Mariana Islands—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Northern Mariana Islands—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.354

Northern Mariana Islands.

* * * * *

Northern Mariana Islands—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
Territory Wide		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

56. Section 81.355 is amended by adding a table titled “Puerto Rico—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Puerto Rico—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.355

Puerto Rico.

* * * * *

Puerto Rico—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
San Juan, PR:
Cataño Municipality		Nonattainment.
Toa Baja Municipality (part)		Nonattainment.
Palo Seco Ward.
Sabana Seca Ward.
San Juan Municipality (part)		Nonattainment.
San Juan Antiguo Ward.
Santurce Ward.
Hato Rey Norte Ward.
Gobernador Pinero Ward.
Guaynabo Municipality (part)		Nonattainment.
Pueblo Viejo Ward.
Bayamón Municipality (part)		Nonattainment.
Juan Sánchez Ward.
Guayama-Salinas, PR:
Salinas Municipality (part)		Nonattainment.
Aguirre Ward.
Lapa Ward.
Rest of Territory		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. The EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

57. Section 81.356 is amended by adding a table entitled “Virgin Islands—2010 Sulfur Dioxide NAAQS (Primary)” following the table “Virgin Islands—1971 Sulfur Dioxide NAAQS (Primary and Secondary)” to read as follows:

§ 81.356

Virgin Islands.

* * * * *

Virgin Islands—2010 Sulfur Dioxide NAAQS (Primary)

Designated area 1	Designation
	Date 2	Type
All of Virgin Islands AQCR 247		Attainment/Unclassifiable.
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.

* * * * *

Footnotes

1.  A total of 29 areas throughout the U.S. were designated in this action published on August 5, 2013 (78 FR 47191). The EPA designated all 29 areas Nonattainment based on violating monitored SO₂ concentrations from Federal Reference Method and Federal Equivalent Method monitors that are sited and operated in accordance with 40 CFR parts 50 and 58, and did not at that time designate any other areas.

2.  A total of 65 areas throughout the U.S. were designated in these actions published on July 12, 2016 (81 FR 45039), and December 13, 2016 (81 FR 89870). Of these 65 areas, seven were designated Nonattainment.

3.  Sierra Club v. McCarthy, No. 3-13-cv-3953 (SI) (N.D. Cal. Mar. 2, 2015).

4.  40 CFR part 51, subpart BB (80 FR 51052; August 21, 2015).

5.  This view was confirmed in Catawba County v. EPA, 571 F.3d 20 (D.C. Cir. 2009).

6.  Tribes are invited to submit recommendations following promulgation of a new or revised NAAQS, but are not required to do so.

7.  See, “Area Designations for the 2010 Revised Primary Sulfur Dioxide National Ambient Air Quality Standards,” memorandum to Regional Air Division Directors, Regions I-X, from Stephen D. Page, dated March 24, 2011.

8.  See, “Updated Guidance for Area Designations for the 2010 Primary Sulfur Dioxide National Ambient Air Quality Standard,” memorandum to Regional Air Division Directors, Regions I-X, from Stephen D. Page, dated March 20, 2015.

9.  The EPA supplemented this guidance with documents first made available to states and other interested parties in 2013 and updated in 2016. See SO₂ NAAQS Designations Source-Oriented Monitoring Technical Assistance Document (February 2016), available at https://www.epa.gov/​sites/​production/​files/​2016-06/​documents/​so2monitoringtad.pdf,, and SO₂ NAAQS Designations Modeling Technical Assistance Document (August 2016), available at https://www.epa.gov/​sites/​production/​files/​2016-06/​documents/​so2modelingtad.pdf.

10.  See “Clarification on the AERMOD Modeling System Version for Use in SO₂ Implementation Efforts and Other Regulatory Actions,” memorandum to EPA Regional Air Division Directors from Richard A. Wayland, dated March 8, 2017. This memo is available at https://www3.epa.gov/​ttn/​scram/​guidance/​clarification/​SO2_​DRR_​Designation_​Modeling_​Clarification_​Memo-03082017.pdf.

11.  The single final TSD for this action consists of a few sections with information that applies to all affected areas or to certain groups of areas with some common features, and many sections that are specific to individual states, territories, or tribal areas. For convenience, the term “TSD” is also used generically to refer to these state/territory/tribe-specific sections. For informational purposes, these individual state/territory/tribe-specific sections/TSDs are available for separate downloading from the indicated EPA website.

12.  These communication letters to the tribes are provided in the dockets for Round 1 (Docket ID No. EPA-HQ-OAR-2012-0233 and Round 2 (Docket ID No. EPA-HQ-OAR-2014-0464).