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 Code of Federal Regulations (Last Updated: November 8, 2024)
 Title 40 - Protection of Environment
 Chapter I - Environmental Protection Agency
 SubChapter C - Air Programs
 Part 81 - Designation of Areas for Air Quality Planning Purposes
 Subpart C - Section 107 Attainment Status Designations

  § 81.321 - Maryland.  

Latest version.

  • § 81.321 Maryland.

    Maryland—TSP

    Designated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards
    Metropolitan Baltimore Intrastate AQCR:
    (a) Baltimore City:
    #111 Zones 61, 65-681 X
    #112 Zone 72X
    #113 Zones 76-80X
    #117 Zones 94-100, 102, 103, 105-11X
    #118 Zones 114-137X
    #119 Zones 138, 140, 144, 146, 149X
    Zones 139, 141-143, 145, 147, 150-56X
    #120 Zones 157-66X
    #121 Zones 168-70, 172, 176-78, 180, 181X
    Zones 167, 171, 173-75, 179, 182X
    #123 Zones 187-90X
    #Zones 193-198X
    Zones 191, 192X
    #125 Zones 199-203X
    #126 Zone 207X
    Zones 204-06X
    (b) Baltimore County:
    #325 Zones 417, 418, 420, 421X
    #326 Zones 428, 431X
    #328 Zone 446X
    #329 Zones 449, 453-58X
    Zones 450-52, 459X
    #330 Zones 461, 462X
    Zones 460, 463-68X
    #331 Zones 469-72X
    (c) Anne Arundel County:
    #201 Zones 208, 209X
    #203 Zones 221-28X
    #204 Zones 230X
    (d) Remainder of AQCRX
    Cumberland-Keyser Interstate AQCR:
    (a) Election District No. 8, Luke, MDX
    (b) Remainder AQCRX
    Central Maryland Interstate AQCRX
    National Capital Interstate AQCRX
    Southern Maryland Intrastate AQCRX
    Eastern Shore Intrastate AQCRX

    1 Regional Planning Districts—defined by the Baltimore Regional Planning Council, Maps showing Districts and non-attainment areas available for inspection at the offices of: EPA, Region III, 6th and Walnut Streets, Phila., Pa. 19106; Md. Bureau of Air Quality and Noise Control, 201 West Preston Street, Baltimore, Md. 21201.

    Maryland—1971 Sulfur Dioxide NAAQS

    [Primary and Secondary]

    Designated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards
    Cumberland-Keyser Interstate AQCR, Election District No. 8, Luke, MdX
    Remainder of StateX

    Maryland—2010 Sulfur Dioxide NAAQS

    [Primary]

    Designated area1 Designation
    Date2 Type
    Anne Arundel County and Baltimore County, MD1 9/12/16Nonattainment.
    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
    Allegany County4/30/2021Attainment/Unclassifiable.
    Anne Arundel County (part)Attainment/Unclassifiable.
    Remainder of County
    Baltimore City, MD9/12/16Attainment/Unclassifiable.
    Baltimore County (part)Attainment/Unclassifiable.
    Remainder of County
    Calvert CountyAttainment/Unclassifiable.
    Caroline CountyAttainment/Unclassifiable.
    Carroll CountyAttainment/Unclassifiable.
    Cecil CountyAttainment/Unclassifiable.
    Charles CountyAttainment/Unclassifiable.
    Dorchester CountyAttainment/Unclassifiable.
    Frederick CountyAttainment/Unclassifiable.
    Garrett CountyAttainment/Unclassifiable.
    Harford CountyAttainment/Unclassifiable.
    Howard CountyAttainment/Unclassifiable.
    Kent CountyAttainment/Unclassifiable.
    Montgomery CountyAttainment/Unclassifiable.
    Prince George's CountyAttainment/Unclassifiable.
    Queen Anne's CountyAttainment/Unclassifiable.
    Somerset CountyAttainment/Unclassifiable.
    St. Mary's CountyAttainment/Unclassifiable.
    Talbot CountyAttainment/Unclassifiable.
    Washington CountyAttainment/Unclassifiable.
    Wicomico CountyAttainment/Unclassifiable.
    Worcester CountyAttainment/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.

    Maryland—Carbon Monoxide

    Designated area Designation Classification
    Date1 Type Date1 Type
    Baltimore Area
    Baltimore City (part)
    Regional Planning District No. 118 (generally corresponding to the Central Business District)12/15/95Attainment
    Washington Area
    Montgomery County (part)
    Election Districts 4, 7, 13Attainment
    Prince George's County (part)
    Election Districts 2, 6, 12, 16, 17, 18Attainment
    AQCR 047 National Capital Interstate (Remainder of)Unclassifiable/Attainment
    Montgomery County (part)
    Remainder of county
    Prince George's County (part)
    Remainder of County
    AQCR 112 Central Maryland IntrastateUnclassifiable/Attainment
    Frederick County
    AQCR 113 Cumberland-Keyser InterstateUnclassifiable/Attainment
    Allegany County
    Garrett County
    Washington County
    AQCR 114 Eastern Shore InterstateUnclassifiable/Attainment
    Caroline County
    Cecil County
    Dorchester County
    Kent County
    Queen Anne's County
    Kent County12/22/06Attainment
    Queen Anne's County12/22/06Attainment
    Somerset County
    Talbot County
    Wicomico County
    Worcester County
    AQCR 115 Metro. Baltimore Intrastate (Remainder of)Unclassifiable/Attainment
    Anne Arundel County
    Baltimore City (part)
    Remainder of City
    Baltimore County
    Carroll County
    Harford County
    Howard County
    AQCR 116 Southern Maryland IntrastateUnclassifiable/Attainment
    Calvert County
    Charles County
    St. Mary's County

    1 This date is November 15, 1990, unless otherwise noted.

    Maryland—Ozone (1-Hour Standard)2

    Designated area Designation Classification
    Date1 Type Date1 Type
    Baltimore Area:
    Anne Arundel County11/15/90Nonattainment11/15/90Severe-15.
    Baltimore
    City of Baltimore11/15/90Nonattainment11/15/90Severe-15.
    Baltimore County11/15/90Nonattainment11/15/90Severe-15.
    Carroll County11/15/90Nonattainment11/15/90Severe-15.
    Harford County11/15/90Nonattainment11/15/90Severe-15.
    Howard County11/15/90Nonattainment11/15/90Severe-15.
    Kent County and Queen Anne's County Area:
    Kent County10/21/04Attainment
    Queen Anne's County10/21/04Attainment
    Philadelphia-Wilmington-Trenton Area:
    Cecil County11/15/90Nonattainment11/15/90Severe-15.
    Washington, DC Area:
    Calvert CountyNonattainment3/25/03Severe
    Charles CountyNonattainment3/25/03Severe
    Frederick CountyNonattainment3/25/03Severe
    Montgomery CountyNonattainment3/25/03Severe
    Prince George's CountyNonattainment3/25/03Severe
    AQCR 113 Cumberland-Keyser InterstateUnclassifiable/Attainment
    Allegany County
    Garrett County
    Washington County
    AQCR 114 Eastern Shore Interstate (Remainder of)Unclassifiable/Attainment
    Caroline County
    Dorchester County
    Somerset County
    Talbot County
    Wicomico County
    Worcester County
    AQCR 116 Southern Maryland Intrastate (Remainder of)Unclassifiable/Attainment
    St. Mary's County

    1 This date is October 18, 2000, unless otherwise noted.

    2 The 1-hour ozone standard is revoked effective June 15, 2005 for all areas in Maryland except the Washington Co. area where it is revoked effective April 15, 2009.

    Maryland—1997 Annual PM2.5 NAAQS

    [Primary and Secondary]

    Designated area Designationa Classification
    Date1 Type Date2 Type
    Baltimore, MD:
    Anne Arundel County12/16/14Attainment
    Baltimore County12/16/14Attainment
    Carroll County12/16/14Attainment
    Harford County12/16/14Attainment
    Howard County12/16/14Attainment
    City of Baltimore12/16/14Attainment
    Martinsburg, WV-Hagerstown, MD:
    Washington County12/16/14Attainment
    Washington, DC-MD-VA:
    Charles County10/6/14Attainment
    Frederick County10/6/14Attainment
    Montgomery County10/6/14Attainment
    Prince George's County10/6/14Attainment
    AQCR 113 Cumberland-Keyser Interstate:
    Allegany CountyUnclassifiable/Attainment.
    Garrett CountyUnclassifiable/Attainment.
    AQCR 114 Eastern Shore Interstate (remainder of):
    Caroline CountyUnclassifiable/Attainment.
    Cecil CountyUnclassifiable/Attainment.
    Dorchester CountyUnclassifiable/Attainment.
    Kent CountyUnclassifiable/Attainment.
    Queen Anne's CountyUnclassifiable/Attainment.
    Somerset CountyUnclassifiable/Attainment.
    Talbot CountyUnclassifiable/Attainment.
    Wicomico CountyUnclassifiable/Attainment.
    Worcester CountyUnclassifiable/Attainment.
    AQCR 116 Southern Maryland Intrastate (remainder of):
    Calvert CountyUnclassifiable/Attainment.
    St. Mary's CountyUnclassifiable/Attainment.

    a Includes Indian Country located in each county or area, except as otherwise specified.

    1 This date is 90 days after January 5, 2005, unless otherwise noted.

    2 This date is July 2, 2014, unless otherwise noted.

    Maryland—2012 Annual PM2.5 NAAQS

    [Primary]

    Designated area1 Designation Classification
    Date2 Type Date2 Type
    AQCR 047 National Capital Interstate (DC-MD-VA) (part):
    Montgomery CountyUnclassifiable/Attainment
    Prince George's CountyUnclassifiable/Attainment
    Metropolitan Baltimore Intrastate AQCR:
    Anne Arundel CountyUnclassifiable/Attainment
    Baltimore CountyUnclassifiable/Attainment
    City of BaltimoreUnclassifiable/Attainment
    Carroll CountyUnclassifiable/Attainment
    Harford CountyUnclassifiable/Attainment
    Howard CountyUnclassifiable/Attainment
    AQCR 112 Central Maryland Intrastate:
    Frederick CountyUnclassifiable/Attainment
    AQCR 113 Cumberland-Keyser Interstate:
    Allegany CountyUnclassifiable/Attainment
    Garrett CountyUnclassifiable/Attainment
    Washington CountyUnclassifiable/Attainment
    AQCR 114 Eastern Shore Intrastate:
    Caroline CountyUnclassifiable/Attainment
    Cecil CountyUnclassifiable/Attainment
    Dorchester CountyUnclassifiable/Attainment
    Kent CountyUnclassifiable/Attainment
    Queen Anne's CountyUnclassifiable/Attainment
    Somerset CountyUnclassifiable/Attainment
    Talbot CountyUnclassifiable/Attainment
    Wicomico CountyUnclassifiable/Attainment
    Worcester CountyUnclassifiable/Attainment
    AQCR 116 Southern Maryland Intrastate:
    Calvert CountyUnclassifiable/Attainment
    Charles CountyUnclassifiable/Attainment
    St. Mary's CountyUnclassifiable/Attainment

    1 Includes areas of Indian country located in each county or area, except as otherwise specified.

    2 This date is April 15, 2015, unless otherwise noted.

    Maryland—1997 24-Hour PM2.5 NAAQS

    [Primary and Secondary]

    Designated area Designationa Classification
    Date1 Type Date Type
    AQCR 047 National Capital Interstate (DC-MD-VA) (part):
    Montgomery CountyUnclassifiable/Attainment.
    Prince George's CountyUnclassifiable/Attainment.
    Metropolitan Baltimore Intrastate AQCR:
    Anne Arundel CountyUnclassifiable/Attainment.
    Baltimore CountyUnclassifiable/Attainment.
    City of BaltimoreUnclassifiable/Attainment.
    Carroll CountyUnclassifiable/Attainment.
    Harford CountyUnclassifiable/Attainment.
    Howard CountyUnclassifiable/Attainment.
    AQCR 112 Central Maryland Intrastate:
    Frederick CountyUnclassifiable/Attainment.
    AQCR 113 Cumberland-Keyser Interstate:
    Allegany CountyUnclassifiable/Attainment.
    Garrett CountyUnclassifiable/Attainment.
    Washington CountyUnclassifiable/Attainment.
    AQCR 114 Eastern Shore Intrastate:
    Caroline CountyUnclassifiable/Attainment.
    Cecil CountyUnclassifiable/Attainment.
    Dorchester CountyUnclassifiable/Attainment.
    Kent CountyUnclassifiable/Attainment.
    Queen Anne's CountyUnclassifiable/Attainment.
    Somerset CountyUnclassifiable/Attainment.
    Talbot CountyUnclassifiable/Attainment.
    Wicomico CountyUnclassifiable/Attainment.
    Worcester CountyUnclassifiable/Attainment.
    AQCR 116 Southern Maryland Intrastate:
    Calvert CountyUnclassifiable/Attainment.
    Charles CountyUnclassifiable/Attainment.
    St. Mary's CountyUnclassifiable/Attainment.

    a Includes Indian Country located in each county or area, except as otherwise specified.

    1 This date is 90 days after January 5, 2005, unless otherwise noted.

    Maryland—2006 24-Hour PM2.5 NAAQS

    [Primary and Secondary]

    Designated area Designationa Classification
    Date1 Type Date Type
    AQCR 047 National Capital Interstate (DC-MD-VA) (part):
    Montgomery CountyUnclassifiable/Attainment.
    Prince George's CountyUnclassifiable/Attainment.
    Metropolitan Baltimore Intrastate AQCR:
    Anne Arundel CountyUnclassifiable/Attainment.
    Baltimore CountyUnclassifiable/Attainment.
    City of BaltimoreUnclassifiable/Attainment.
    Carroll CountyUnclassifiable/Attainment.
    Harford CountyUnclassifiable/Attainment.
    Howard CountyUnclassifiable/Attainment.
    AQCR 112 Central Maryland Intrastate:
    Frederick CountyUnclassifiable/Attainment.
    AQCR 113 Cumberland-Keyser Interstate:
    Allegany CountyUnclassifiable/Attainment.
    Garrett CountyUnclassifiable/Attainment.
    Washington CountyUnclassifiable/Attainment.
    AQCR 114 Eastern Shore Intrastate:
    Caroline CountyUnclassifiable/Attainment.
    Cecil CountyUnclassifiable/Attainment.
    Dorchester CountyUnclassifiable/Attainment.
    Kent CountyUnclassifiable/Attainment.
    Queen Anne's CountyUnclassifiable/Attainment.
    Somerset CountyUnclassifiable/Attainment.
    Talbot CountyUnclassifiable/Attainment.
    Wicomico CountyUnclassifiable/Attainment.
    Worcester CountyUnclassifiable/Attainment.
    AQCR 116 Southern Maryland Intrastate:
    Calvert CountyUnclassifiable/Attainment.
    Charles CountyUnclassifiable/Attainment.
    St. Mary's CountyUnclassifiable/Attainment.

    a Includes Indian Country located in each county or area, except as otherwise specified.

    1 This date is 30 days after November 13, 2009, unless otherwise noted.

    Maryland—NO2 (1971 Annual Standard)

    Designated area Does not meet primary standards Cannot be classified or better than national standards
    State of MarylandX

    Maryland—NO2 (2010 1-Hour Standard)

    Designated area Designationa
    Date1 Type
    Allegany CountyUnclassifiable/Attainment.
    Anne Arundel CountyUnclassifiable/Attainment.
    Baltimore CountyUnclassifiable/Attainment.
    City of BaltimoreUnclassifiable/Attainment.
    Calvert CountyUnclassifiable/Attainment.
    Caroline CountyUnclassifiable/Attainment.
    Carroll CountyUnclassifiable/Attainment.
    Cecil CountyUnclassifiable/Attainment.
    Charles CountyUnclassifiable/Attainment.
    Dorchester CountyUnclassifiable/Attainment.
    Frederick CountyUnclassifiable/Attainment.
    Garrett CountyUnclassifiable/Attainment.
    Harford CountyUnclassifiable/Attainment.
    Howard CountyUnclassifiable/Attainment.
    Kent CountyUnclassifiable/Attainment.
    Montgomery CountyUnclassifiable/Attainment.
    Prince George's CountyUnclassifiable/Attainment.
    Queene Anne's CountyUnclassifiable/Attainment.
    St. Mary's CountyUnclassifiable/Attainment.
    Somerset CountyUnclassifiable/Attainment.
    Talbot CountyUnclassifiable/Attainment.
    Washington CountyUnclassifiable/Attainment.
    Wicomico CountyUnclassifiable/Attainment.
    Worchester CountyUnclassifiable/Attainment.

    a Includes Indian Country located in each county or area, except as otherwise specified.

    1 This date is 90 days after October 31, 2011, unless otherwise noted.

    Maryland—1997 8-Hour Ozone NAAQS

    [Primary and Secondary]

    Designated area Designationa Category/classification
    Date1 Type Date1 Type
    Baltimore, MD:
    Anne Arundel CountyNonattainment(5)Subpart 2/Serious.4
    City of BaltimoreNonattainment(5)Subpart 2/Serious.4
    Baltimore CountyNonattainment(5)Subpart 2/Serious.4
    Carroll CountyNonattainment(5)Subpart 2/Serious.4
    Harford CountyNonattainment(5)Subpart 2/Serious.4
    Howard CountyNonattainment(5)Subpart 2/Serious.4
    Kent and Queen Anne's Area
    Kent County1/22/07Attainment
    Queen Anne's County1/22/07Attainment
    Washington County (Hagerstown), MD:
    Washington County(2)Attainment.
    Philadelphia-Wilmin-Atlantic Ci, PA-NJ-MD-DE:
    Cecil CountyNonattainmentSubpart 2/Moderate.4
    Washington, DC-MD-VA:
    Calvert CountyNonattainmentSubpart 2/Moderate.
    Charles CountyNonattainmentSubpart 2/Moderate.
    Frederick CountyNonattainmentSubpart 2/Moderate.
    Montgomery CountyNonattainmentSubpart 2/Moderate.
    Prince George's CountyNonattainmentSubpart 2/Moderate.
    AQCR 113 Cumberland-Keyser InterstateUnclassifiable/Attainment
    Allegany County
    Garrett County
    AQCR 114 Eastern Shore Interstate (remainder of)Unclassifiable/Attainment
    Caroline County
    Dorchester County
    Somerset County
    Talbot County
    Wicomico County
    Worcester County
    AQCR 116 Southern Maryland Intrastate (remainder of)Unclassifiable/Attainment
    St. Mary's County

    a Includes Indian Country located in each county or area, except as otherwise specified.

    1 This date is June 15, 2004, unless otherwise noted.

    2 Effective April 15, 2008.

    3 November 22, 2004.

    4 Attainment date is June 15, 2013.

    5 Effective March 2, 2012.

    Maryland—2008 8-Hour Ozone NAAQS

    [Primary and Secondary]

    Designated area Designation Classification
    Date1 Type Date1 Type
    Baltimore, MD:2 NonattainmentModerate.
    Anne Arundel County
    Baltimore County
    Baltimore City
    Carroll County
    Harford County
    Howard County
    Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE:2 Nonattainment6/3/16Marginal.4
    Cecil County
    Washington, DC-MD-VA:2 April 15, 2019Attainment
    Calvert County4/15/19Attainment
    Charles County4/15/19Attainment
    Frederick County4/15/19Attainment
    Montgomery County4/15/19Attainment
    Prince George's County4/15/19Attainment
    AQCR 113 Cumberland-Keyser Interstate3 Unclassifiable/Attainment
    Allegany County
    Garrett County
    Washington County
    AQCR 114 Eastern Shore Interstate: (remainder)3 Unclassifiable/Attainment
    Caroline County
    Dorchester County
    Kent County
    Queen Anne's County
    Somerset County
    Talbot County
    Wicomico County
    Worcester County
    AQCR 116 Southern Maryland Intrastate: (remainder)3 Unclassifiable/Attainment
    St. Mary's County

    1 This date is July 20, 2012, unless otherwise noted.

    2 Excludes Indian country located in each area, unless otherwise noted.

    3 Includes any Indian country in each county or area, unless otherwise specified.

    4 Attainment date is extended to July 20, 2016.

    Maryland—2015 8-Hour Ozone NAAQS

    [Primary and Secondary]

    Moderate
    Designated area1 Designation Classification
    Date2 Type Date2 Type
    Baltimore, MDNonattainment118/71/2224Serious.
    Anne Arundel County.
    Baltimore County.
    Carroll County.
    Harford County.
    Howard County.
    City of Baltimore.
    Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DENonattainment7/30/24Serious.
    Cecil County.
    Washington, DC-MD-VANonattainment11/7/22Moderate.
    Calvert County.
    Charles County.
    Fredrick County.
    Montgomery County.
    Prince George's County.
    Allegany County1/16/18Attainment/Unclassifiable
    Caroline County1/16/18Attainment/Unclassifiable
    Dorchester CountyAttainment/Unclassifiable
    Garrett County1/16/18Attainment/Unclassifiable
    Kent CountyAttainment/Unclassifiable
    Queen Anne's CountyAttainment/Unclassifiable
    St. Mary's CountyAttainment/Unclassifiable
    Somerset County1/16/18Attainment/Unclassifiable
    Talbot CountyAttainment/Unclassifiable
    Washington CountyAttainment/Unclassifiable
    Wicomico County1/16/18Attainment/Unclassifiable
    Worcester County1/16/18Attainment/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 August 3, 2018, unless otherwise noted.

    Maryland—2008 Lead NAAQS

    Designated area Designation for the 2008 NAAQSa
    Date1 Type
    Whole StateUnclassifiable/Attainment.

    a Includes Indian Country located in each county or area, except as otherwise specified.

    1 December 31, 2011 unless otherwise noted.

    [43 FR 40510, Sept. 12, 1978]

    Editorial Note

    Editorial Note:

    For Federal Register citations affecting § 81.321, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.