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Code of Federal Regulations (Last Updated: October 10, 2024) |
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Title 40 - Protection of Environment |
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Chapter I - Environmental Protection Agency |
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SubChapter C - Air Programs |
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Part 51 - Requirements for Preparation, Adoption, and Submittal of Implementation Plans |
| Subpart A - Air Emissions Reporting Requirements |
| Specific Reporting Requirements |
| § 51.15 - What data does my state need to report to EPA? |
| § 51.20 - What are the emission thresholds that separate point and nonpoint sources? |
| § 51.25 - What geographic area must my state's inventory cover? |
| § 51.30 - When does my state report which emissions data to EPA? |
| § 51.35 - How can my state equalize the emission inventory effort from year to year? |
| § 51.40 - In what form and format should my state report the data to EPA? |
| § 51.45 - Where should my state report the data? |
| § 51.50 - What definitions apply to this subpart? |
| General Information for Inventory Preparers |
| § 51.1 - Who is responsible for actions described in this subpart? |
| § 51.5 - What tools are available to help prepare and report emissions data? |
| § 51.10 - [Reserved] |
| Appendix A to Subpart A of Part 51 - Tables |
| Subpart AA - Provisions for Implementation of the 2008 Ozone National Ambient Air Quality Standards |
| § 51.1100 - Definitions. |
| § 51.1101 - Applicability of part 51. |
| § 51.1102 - Classification and nonattainment area planning provisions. |
| § 51.1103 - Application of classification and attainment date provisions in CAA section 181 to areas subject to § 51.1102. |
| § 51.1104 - [Reserved] |
| § 51.1105 - Transition from the 1997 ozone NAAQS to the 2008 ozone NAAQS and anti-backsliding. |
| § 51.1106 - Redesignation to nonattainment following initial designations. |
| § 51.1107 - Determining eligibility for 1-year attainment date extensions for the 2008 ozone NAAQS under CAA section 181(a)(5). |
| § 51.1108 - Modeling and attainment demonstration requirements. |
| § 51.1109 - [Reserved] |
| § 51.1110 - Requirements for reasonable further progress (RFP). |
| § 51.1111 - [Reserved] |
| § 51.1112 - Requirements for reasonably available control technology (RACT) and reasonably available control measures (RACM). |
| § 51.1113 - Section 182(f) NOX exemption provisions. |
| § 51.1114 - New source review requirements. |
| § 51.1115 - Emissions inventory requirements. |
| § 51.1116 - Requirements for an Ozone Transport Region. |
| § 51.1117 - Fee programs for Severe and Extreme nonattainment areas that fail to attain. |
| § 51.1118 - Suspension of SIP planning requirements in nonattainment areas that have air quality data that meet an ozone NAAQS. |
| § 51.1119 - Applicability. |
| §§ 51.1104--52.1119 - xxx |
| Subpart BB - Data Requirements for Characterizing Air Quality for the Primary SO2 NAAQS |
| § 51.1200 - Definitions. |
| § 51.1201 - Purpose. |
| § 51.1202 - Applicability. |
| § 51.1203 - Air agency requirements. |
| § 51.1204 - Enforceable emission limits providing for attainment. |
| § 51.1205 - Ongoing data requirements. |
| Subparts B--E - XXX |
| Subpart CC - Provisions for Implementation of the 2015 Ozone National Ambient Air Quality Standards |
| § 51.1300 - Definitions. |
| § 51.1301 - Applicability of this part. |
| § 51.1302 - Classification and nonattainment area planning provisions. |
| § 51.1303 - Application of classification and attainment date provisions in CAA section 181 to areas subject to § 51.1302. |
| § 51.1304 - xxx |
| § 51.1305 - xxx |
| § 51.1306 - xxx |
| § 51.1307 - xxx |
| § 51.1308 - xxx |
| § 51.1309 - [Reserved] |
| § 51.1310 - xxx |
| § 51.1311 - [Reserved] |
| § 51.1312 - xxx |
| § 51.1313 - xxx |
| § 51.1314 - xxx |
| § 51.1315 - xxx |
| § 51.1316 - xxx |
| § 51.1317 - xxx |
| § 51.1318 - xxx |
| § 51.1319 - [Reserved] |
| §§ 51.1304--51.1305 - [Reserved] |
| Subpart F - Procedural Requirements |
| § 51.100 - Definitions. |
| § 51.101 - Stipulations. |
| § 51.102 - Public hearings. |
| § 51.103 - Submission of plans, preliminary review of plans. |
| § 51.104 - Revisions. |
| § 51.105 - Approval of plans. |
| Subpart G - Control Strategy |
| § 51.110 - Attainment and maintenance of national standards. |
| § 51.111 - Description of control measures. |
| § 51.112 - Demonstration of adequacy. |
| § 51.113 - [Reserved] |
| § 51.114 - Emissions data and projections. |
| § 51.115 - Air quality data and projections. |
| § 51.116 - Data availability. |
| § 51.117 - Additional provisions for lead. |
| § 51.118 - Stack height provisions. |
| § 51.119 - Intermittent control systems. |
| § 51.120 - Requirements for State Implementation Plan revisions relating to new motor vehicles. |
| § 51.121 - Findings and requirements for submission of State implementation plan revisions relating to emissions of nitrogen oxides. |
| § 51.122 - Emissions reporting requirements for SIP revisions relating to budgets for NOX emissions. |
| § 51.123 - Findings and requirements for submission of State implementation plan revisions relating to emissions of oxides of nitrogen pursuant to the Clean Air Interstate Rule. |
| § 51.124 - Findings and requirements for submission of State implementation plan revisions relating to emissions of sulfur dioxide pursuant to the Clean Air Interstate Rule. |
| § 51.125 - [Reserved] |
| § 51.126 - Determination of widespread use of ORVR and waiver of CAA section 182(b)(3) Stage II gasoline vapor recovery requirements. |
| Subpart H - Prevention of Air Pollution Emergency Episodes |
| § 51.150 - Classification of regions for episode plans. |
| § 51.151 - Significant harm levels. |
| § 51.152 - Contingency plans. |
| § 51.153 - Reevaluation of episode plans. |
| Subpart I - Review of New Sources and Modifications |
| § 51.160 - Legally enforceable procedures. |
| § 51.161 - Public availability of information. |
| § 51.162 - Identification of responsible agency. |
| § 51.163 - Administrative procedures. |
| § 51.164 - Stack height procedures. |
| § 51.165 - Permit requirements. |
| § 51.166 - Prevention of significant deterioration of air quality. |
| Subpart J - Ambient Air Quality Surveillance |
| § 51.190 - Ambient air quality monitoring requirements. |
| Subpart K - Source Surveillance |
| § 51.210 - General. |
| § 51.211 - Emission reports and recordkeeping. |
| § 51.212 - Testing, inspection, enforcement, and complaints. |
| § 51.213 - Transportation control measures. |
| § 51.214 - Continuous emission monitoring. |
| Subpart L - Legal Authority |
| § 51.230 - Requirements for all plans. |
| § 51.231 - Identification of legal authority. |
| § 51.232 - Assignment of legal authority to local agencies. |
| Subpart M - Intergovernmental Consultation |
| Agency Designation |
| § 51.240 - General plan requirements. |
| § 51.241 - Nonattainment areas for carbon monoxide and ozone. |
| § 51.242 - [Reserved] |
| Subpart N - Compliance Schedules |
| § 51.260 - Legally enforceable compliance schedules. |
| § 51.261 - Final compliance schedules. |
| § 51.262 - Extension beyond one year. |
| Subpart O - Miscellaneous Plan Content Requirements |
| § 51.280 - Resources. |
| § 51.281 - Copies of rules and regulations. |
| § 51.285 - Public notification. |
| § 51.286 - Electronic reporting. |
| Subpart P - Protection of Visibility |
| § 51.300 - Purpose and applicability. |
| § 51.301 - Definitions. |
| § 51.302 - Reasonably attributable visibility impairment. |
| § 51.303 - Exemptions from control. |
| § 51.304 - Identification of integral vistas. |
| § 51.305 - Monitoring for reasonably attributable visibility impairment. |
| § 51.306 - [Reserved] |
| § 51.307 - New source review. |
| § 51.308 - Regional haze program requirements. |
| § 51.309 - Requirements related to the Grand Canyon Visibility Transport Commission. |
| Subpart Q - Reports |
| Air Quality Data Reporting |
| § 51.320 - Annual air quality data report. |
| Source Emissions and State Action Reporting |
| § 51.321 - Annual source emissions and State action report. |
| § 51.322 - Sources subject to emissions reporting. |
| § 51.323 - Reportable emissions data and information. |
| § 51.324 - Progress in plan enforcement. |
| § 51.326 - Reportable revisions. |
| § 51.327 - Enforcement orders and other State actions. |
| § 51.328 - [Reserved] |
| Subpart R - Extensions |
| § 51.341 - Request for 18-month extension. |
| Subpart S - Inspection/Maintenance Program Requirements |
| § 51.350 - Applicability. |
| § 51.351 - Enhanced I/M performance standard. |
| § 51.352 - Basic I/M performance standard. |
| § 51.353 - Network type and program evaluation. |
| § 51.354 - Adequate tools and resources. |
| § 51.355 - Test frequency and convenience. |
| § 51.356 - Vehicle coverage. |
| § 51.357 - Test procedures and standards. |
| § 51.358 - Test equipment. |
| § 51.359 - Quality control. |
| § 51.360 - Waivers and compliance via diagnostic inspection. |
| § 51.361 - Motorist compliance enforcement. |
| § 51.362 - Motorist compliance enforcement program oversight. |
| § 51.363 - Quality assurance. |
| § 51.364 - Enforcement against contractors, stations and inspectors. |
| § 51.365 - Data collection. |
| § 51.366 - Data analysis and reporting. |
| § 51.367 - Inspector training and licensing or certification. |
| § 51.368 - Public information and consumer protection. |
| § 51.369 - Improving repair effectiveness. |
| § 51.370 - Compliance with recall notices. |
| § 51.371 - On-road testing. |
| § 51.372 - State Implementation Plan submissions. |
| § 51.373 - Implementation deadlines. |
| Appendix B to Subpart S - Test Procedures |
| Appendix C to Subpart S - Steady-State Short Test Standards |
| Appendix D to Subpart S - Steady-State Short Test Equipment |
| Appendix E to Subpart S - Transient Test Driving Cycle |
| Appendix A to Subpart S of Part 51 - Calibrations, Adjustments and Quality Control |
| Appendix B to Subpart S of Part 51 - Test Procedures |
| Appendix C to Subpart S of Part 51 - Steady-State Short Test Standards |
| Appendix D to Subpart S of Part 51 - Steady-State Short Test Equipment |
| Appendix E to Subpart S of Part 51 - Transient Test Driving Cycle |
| Subpart T - Conformity to State or Federal Implementation Plans of Transportation Plans, Programs, and Projects Developed, Funded or Approved Under Title 23 U.S.C. or the Federal Transit Laws |
| § 51.390 - Implementation plan revision. |
| § 51.392 - Definitions. |
| § 51.394 - Applicability. |
| § 51.396 - Implementation plan revision. |
| § 51.398 - Priority. |
| § 51.400 - Frequency of conformity determinations. |
| § 51.402 - Consultation. |
| § 51.404 - Content of transportation plans. |
| § 51.406 - Relationship of transportation plan and TIP conformity with the NEPA process. |
| § 51.408 - Fiscal constraints for transportation plans and TIPs. |
| § 51.410 - Criteria and procedures for determining conformity of transportation plans, programs, and projects: General. |
| § 51.412 - Criteria and procedures: Latest planning assumptions. |
| § 51.414 - Criteria and procedures: Latest emissions model. |
| § 51.416 - Criteria and procedures: Consultation. |
| § 51.418 - Criteria and procedures: Timely implementation of TCMs. |
| § 51.420 - Criteria and procedures: Currently conforming transportation plan and TIP. |
| § 51.422 - Criteria and procedures: Projects from a plan and TIP. |
| § 51.424 - Criteria and procedures: Localized CO and PM10 violations (hot spots). |
| § 51.426 - Criteria and procedures: Compliance with PM10 control measures. |
| § 51.428 - Criteria and procedures: Motor vehicle emissions budget (transportation plan). |
| § 51.430 - Criteria and procedures: Motor vehicle emissions budget (TIP). |
| § 51.432 - Criteria and procedures: Motor vehicle emissions budget (project not from a plan and TIP). |
| § 51.434 - Criteria and procedures: Localized CO violations (hot spots) in the interim period. |
| § 51.436 - Criteria and procedures: Interim period reductions in ozone and CO areas (transportation plan). |
| § 51.438 - Criteria and procedures: Interim period reductions in ozone and CO areas (TIP). |
| § 51.440 - Criteria and procedures: Interim period reductions for ozone and CO areas (project not from a plan and TIP). |
| § 51.442 - Criteria and procedures: Interim period reductions for PM10 and NO2 areas (transportation plan). |
| § 51.444 - Criteria and procedures: Interim period reductions for PM10 and NO2 areas (TIP). |
| § 51.446 - Criteria and procedures: Interim period reductions for PM10 and NO2 areas (project not from a plan and TIP). |
| § 51.448 - Transition from the interim period to the control strategy period. |
| § 51.450 - Requirements for adoption or approval of projects by recipients of funds designated under title 23 U.S.C. or the Federal Transit Act. |
| § 51.452 - Procedures for determining regional transportation-related emissions. |
| § 51.454 - Procedures for determining localized CO and PM10 concentrations (hot-spot analysis). |
| § 51.456 - Using the motor vehicle emissions budget in the applicable implementation plan (or implementation plan submission). |
| § 51.458 - Enforceability of design concept and scope and project-level mitigation and control measures. |
| § 51.460 - Exempt projects. |
| § 51.462 - Projects exempt from regional emissions analyses. |
| § 51.464 - Special provisions for nonattainment areas which are not required to demonstrate reasonable further progress and attainment. |
| Subpart U - Economic Incentive Programs |
| § 51.490 - Applicability. |
| § 51.491 - Definitions. |
| § 51.492 - State program election and submittal. |
| § 51.493 - State program requirements. |
| § 51.494 - Use of program revenues. |
| Subpart W - Determining Conformity of General Federal Actions to State or Federal Implementation Plans |
| § 51.850 - [Reserved] |
| § 51.851 - State implementation plan (SIP) or Tribal implementation plan (TIP) revision. |
| § 51.852 - Definitions. |
| § 51.853 - Applicability. |
| § 51.854 - Conformity analysis. |
| § 51.855 - Reporting requirements. |
| § 51.856 - Public participation. |
| § 51.857 - Frequency of conformity determinations. |
| § 51.858 - Criteria for determining conformity of general Federal actions. |
| § 51.859 - Procedures for conformity determinations of general Federal actions. |
| § 51.860 - Mitigation of air quality impacts. |
| Appendix B to Appendix W of Part 51 - Summaries of Alternative Air Quality Models |
| Appendix C to Appendix W of Part 51 - Example Air Quality Analysis Checklist |
| §§ 51.852--51.860 - [Reserved] |
| Subpart X - Provisions for Implementation of 8-hour Ozone National Ambient Air Quality Standard |
| § 51.900 - Definitions. |
| § 51.901 - Applicability of part 51. |
| § 51.902 - Which classification and nonattainment area planning provisions of the CAA shall apply to areas designated nonattainment for the 1997 8-hour NAAQS? |
| § 51.903 - How do the classification and attainment date provisions in section 181 of subpart 2 of the CAA apply to areas subject to § 51.902(a)? |
| § 51.904 - How do the classification and attainment date provisions in section 172(a) of subpart 1 of the CAA apply to areas subject to § 51.902(b)? |
| § 51.905 - How do areas transition from the 1-hour NAAQS to the 1997 8-hour NAAQS and what are the anti-backsliding provisions? |
| § 51.906 - Redesignation to nonattainment following initial designations for the 8-hour NAAQS. |
| § 51.907 - For an area that fails to attain the 8-hour NAAQS by its attainment date, how does EPA interpret sections 172(a)(2)(C)(ii) and 181(a)(5)(B) of the CAA? |
| § 51.908 - What modeling and attainment demonstration requirements apply for purposes of the 8-hour ozone NAAQS? |
| § 51.909 - [Reserved] |
| § 51.910 - What requirements for reasonable further progress (RFP) under sections 172(c)(2) and 182 apply for areas designated nonattainment for the 8-hour ozone NAAQS? |
| § 51.911 - [Reserved] |
| § 51.912 - What requirements apply for reasonably available control technology (RACT) and reasonably available control measures (RACM) under the 8-hour NAAQS? |
| § 51.913 - How do the section 182(f) NOX exemption provisions apply for the 8-hour NAAQS? |
| § 51.914 - What new source review requirements apply for 8-hour ozone nonattainment areas? |
| § 51.915 - What emissions inventory requirements apply under the 8-hour NAAQS? |
| § 51.916 - What are the requirements for an Ozone Transport Region under the 8-hour NAAQS? |
| § 51.917 - What is the effective date of designation for the Las Vegas, NV, 8-hour ozone nonattainment area? |
| § 5.918 - xxx |
| § 51.918 - Can any SIP planning requirements be suspended in 8-hour ozone nonattainment areas that have air quality data that meets the NAAQS? |
| § 51.919 - Applicability. |
| §§ 51.909--51.916 - [Reserved] |
| Subpart Y - Mitigation Requirements |
| § 51.930 - Mitigation of Exceptional Events. |
| Subpart Z - Provisions for Implementation of PM2.5 National Ambient Air Quality Standards |
| § 51.1000 - Definitions. |
| § 51.1001 - Applicability of part 51. |
| § 51.1002 - Classifications and reclassifications. |
| § 51.1003 - Attainment plan due dates and submission requirements. |
| § 51.1004 - Attainment dates. |
| § 51.1005 - Attainment date extensions. |
| § 51.1006 - Optional PM2.5 precursor demonstrations |
| § 51.1007 - [Reserved] |
| § 51.1008 - Emissions inventory requirements. |
| § 51.1009 - Moderate area attainment plan control strategy requirements. |
| § 51.1010 - Serious area attainment plan control strategy requirements. |
| § 51.1011 - Attainment demonstration and modeling requirements. |
| § 51.1012 - Reasonable further progress (RFP) requirements. |
| § 51.1013 - Quantitative milestone requirements. |
| § 51.1014 - Contingency measure requirements. |
| § 51.1015 - Clean data requirements. |
| Appendix L to Part 51 - Example Regulations for Prevention of Air Pollution Emergency Episodes |
| Appendix M to Part 51 - Recommended Test Methods for State Implementation Plans |
| Appendix P to Part 51 - Minimum Emission Monitoring Requirements |
| Appendix S to Part 51 - Emission Offset Interpretative Ruling |
| Appendix V to Part 51 - Criteria for Determining the Completeness of Plan Submissions |
| Appendix W to Part 51 - Guideline on Air Quality Models |
| Appendix X to Part 51 - Examples of Economic Incentive Programs |
| Appendix Y to Part 51 - Guidelines for BART Determinations Under the Regional Haze Rule |
| Appendixes A-K to Part 51 - [Reserved] |
| Appendixes A-K to Part 51 - [Reserved] |
| Appendixes N-O to Part 51 - [Reserved] |
| Appendixes N-O to Part 51 - [Reserved] |
| Appendixes Q-R to Part 51 - [Reserved] |
| Appendixes Q-R to Part 51 - [Reserved] |
| Appendixes T-U to Part 51 - [Reserved] |
| Appendixes T-U to Part 51 - [Reserved] |
| Appendix A to Appendix W of Part 51 - Summaries of Preferred Air Quality Models |