{"data":{"id":"us/40-cfr-81.321","jurisdiction":"us","citation":"40 CFR 81.321","heading":"Maryland.","body":"Maryland—TSP\nDesignated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards\nMetropolitan Baltimore Intrastate AQCR:\n(a) Baltimore City:\n#111 Zones 61, 65-68 1 X\n#112 Zone 72 X\n#113 Zones 76-80 X\n#117 Zones 94-100, 102, 103, 105-11 X\n#118 Zones 114-137 X\n#119 Zones 138, 140, 144, 146, 149 X\nZones 139, 141-143, 145, 147, 150-56 X\n#120 Zones 157-66 X\n#121 Zones 168-70, 172, 176-78, 180, 181 X\nZones 167, 171, 173-75, 179, 182 X\n#123 Zones 187-90 X\n#Zones 193-198 X\nZones 191, 192 X\n#125 Zones 199-203 X\n#126 Zone 207 X\nZones 204-06 X\n(b) Baltimore County:\n#325 Zones 417, 418, 420, 421 X\n#326 Zones 428, 431 X\n#328 Zone 446 X\n#329 Zones 449, 453-58 X\nZones 450-52, 459 X\n#330 Zones 461, 462 X\nZones 460, 463-68 X\n#331 Zones 469-72 X\n(c) Anne Arundel County:\n#201 Zones 208, 209 X\n#203 Zones 221-28 X\n#204 Zones 230 X\n(d) Remainder of AQCR X\nCumberland-Keyser Interstate AQCR:\n(a) Election District No. 8, Luke, MD X\n(b) Remainder AQCR X\nCentral Maryland Interstate AQCR X\nNational Capital Interstate AQCR X\nSouthern Maryland Intrastate AQCR X\nEastern Shore Intrastate AQCR X\n1 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.\nMaryland—1971 Sulfur Dioxide NAAQS\n[Primary and Secondary]\nDesignated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards\nCumberland-Keyser Interstate AQCR, Election District No. 8, Luke, Md X\nRemainder of State X\nMaryland—2010 Sulfur Dioxide NAAQS\n[Primary]\nDesignated area 1 Designation\nDate 2 Type\nAnne Arundel County and Baltimore County, MD1 9/12/2016 Nonattainment.\nAnne Arundel County (part)\nPortions 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\nBaltimore County (part)\nPortions 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\nAllegany County 4/30/2021 Attainment/Unclassifiable.\nAnne Arundel County (part) Attainment/Unclassifiable.\nRemainder of County\nBaltimore City, MD 9/12/2016 Attainment/Unclassifiable.\nBaltimore County (part) Attainment/Unclassifiable.\nRemainder of County\nCalvert County Attainment/Unclassifiable.\nCaroline County Attainment/Unclassifiable.\nCarroll County Attainment/Unclassifiable.\nCecil County Attainment/Unclassifiable.\nCharles County Attainment/Unclassifiable.\nDorchester County Attainment/Unclassifiable.\nFrederick County Attainment/Unclassifiable.\nGarrett County Attainment/Unclassifiable.\nHarford County Attainment/Unclassifiable.\nHoward County Attainment/Unclassifiable.\nKent County Attainment/Unclassifiable.\nMontgomery County Attainment/Unclassifiable.\nPrince George's County Attainment/Unclassifiable.\nQueen Anne's County Attainment/Unclassifiable.\nSomerset County Attainment/Unclassifiable.\nSt. Mary's County Attainment/Unclassifiable.\nTalbot County Attainment/Unclassifiable.\nWashington County Attainment/Unclassifiable.\nWicomico County Attainment/Unclassifiable.\nWorcester County Attainment/Unclassifiable.\n1 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.\n2 This date is April 9, 2018, unless otherwise noted.\nMaryland—Carbon Monoxide\nDesignated area Designation Classification\nDate 1 Type Date 1 Type\nBaltimore Area\nBaltimore City (part)\nRegional Planning District No. 118 (generally corresponding to the Central Business District) 12/15/1995 Attainment\nWashington Area\nMontgomery County (part)\nElection Districts 4, 7, 13 Attainment\nPrince George's County (part)\nElection Districts 2, 6, 12, 16, 17, 18 Attainment\nAQCR 047 National Capital Interstate (Remainder of) Unclassifiable/Attainment\nMontgomery County (part)\nRemainder of county\nPrince George's County (part)\nRemainder of County\nAQCR 112 Central Maryland Intrastate Unclassifiable/Attainment\nFrederick County\nAQCR 113 Cumberland-Keyser Interstate Unclassifiable/Attainment\nAllegany County\nGarrett County\nWashington County\nAQCR 114 Eastern Shore Interstate Unclassifiable/Attainment\nCaroline County\nCecil County\nDorchester County\nKent County\nQueen Anne's County\nKent County 12/22/2006 Attainment\nQueen Anne's County 12/22/2006 Attainment\nSomerset County\nTalbot County\nWicomico County\nWorcester County\nAQCR 115 Metro. Baltimore Intrastate (Remainder of) Unclassifiable/Attainment\nAnne Arundel County\nBaltimore City (part)\nRemainder of City\nBaltimore County\nCarroll County\nHarford County\nHoward County\nAQCR 116 Southern Maryland Intrastate Unclassifiable/Attainment\nCalvert County\nCharles County\nSt. Mary's County\n1 This date is November 15, 1990, unless otherwise noted.\nMaryland—Ozone (1-Hour Standard)2\nDesignated area Designation Classification\nDate 1 Type Date 1 Type\nBaltimore Area:\nAnne Arundel County 11/15/1990 Nonattainment 11/15/1990 Severe-15.\nBaltimore\nCity of Baltimore 11/15/1990 Nonattainment 11/15/1990 Severe-15.\nBaltimore County 11/15/1990 Nonattainment 11/15/1990 Severe-15.\nCarroll County 11/15/1990 Nonattainment 11/15/1990 Severe-15.\nHarford County 11/15/1990 Nonattainment 11/15/1990 Severe-15.\nHoward County 11/15/1990 Nonattainment 11/15/1990 Severe-15.\nKent County and Queen Anne's County Area:\nKent County 10/21/2004 Attainment\nQueen Anne's County 10/21/2004 Attainment\nPhiladelphia-Wilmington-Trenton Area:\nCecil County 11/15/1990 Nonattainment 11/15/1990 Severe-15.\nWashington, DC Area:\nCalvert County Nonattainment 3/25/2003 Severe\nCharles County Nonattainment 3/25/2003 Severe\nFrederick County Nonattainment 3/25/2003 Severe\nMontgomery County Nonattainment 3/25/2003 Severe\nPrince George's County Nonattainment 3/25/2003 Severe\nAQCR 113 Cumberland-Keyser Interstate Unclassifiable/Attainment\nAllegany County\nGarrett County\nWashington County\nAQCR 114 Eastern Shore Interstate (Remainder of) Unclassifiable/Attainment\nCaroline County\nDorchester County\nSomerset County\nTalbot County\nWicomico County\nWorcester County\nAQCR 116 Southern Maryland Intrastate (Remainder of) Unclassifiable/Attainment\nSt. Mary's County\n1 This date is October 18, 2000, unless otherwise noted.\n2 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.\nMaryland—1997 Annual PM2.5 NAAQS\n[Primary and Secondary]\nDesignated area Designation a Classification\nDate 1 Type Date 2 Type\nBaltimore, MD:\nAnne Arundel County 12/16/2014 Attainment\nBaltimore County 12/16/2014 Attainment\nCarroll County 12/16/2014 Attainment\nHarford County 12/16/2014 Attainment\nHoward County 12/16/2014 Attainment\nCity of Baltimore 12/16/2014 Attainment\nMartinsburg, WV-Hagerstown, MD:\nWashington County 12/16/2014 Attainment\nWashington, DC-MD-VA:\nCharles County 10/6/2014 Attainment\nFrederick County 10/6/2014 Attainment\nMontgomery County 10/6/2014 Attainment\nPrince George's County 10/6/2014 Attainment\nAQCR 113 Cumberland-Keyser Interstate:\nAllegany County Unclassifiable/Attainment.\nGarrett County Unclassifiable/Attainment.\nAQCR 114 Eastern Shore Interstate (remainder of):\nCaroline County Unclassifiable/Attainment.\nCecil County Unclassifiable/Attainment.\nDorchester County Unclassifiable/Attainment.\nKent County Unclassifiable/Attainment.\nQueen Anne's County Unclassifiable/Attainment.\nSomerset County Unclassifiable/Attainment.\nTalbot County Unclassifiable/Attainment.\nWicomico County Unclassifiable/Attainment.\nWorcester County Unclassifiable/Attainment.\nAQCR 116 Southern Maryland Intrastate (remainder of):\nCalvert County Unclassifiable/Attainment.\nSt. Mary's County Unclassifiable/Attainment.\na Includes Indian Country located in each county or area, except as otherwise specified.\n1 This date is 90 days after January 5, 2005, unless otherwise noted.\n2 This date is July 2, 2014, unless otherwise noted.\nMaryland—2012 Annual PM2.5 NAAQS\n[Primary]\nDesignated area 1 Designation Classification\nDate 2 Type Date 2 Type\nAQCR 047 National Capital Interstate (DC-MD-VA) (part):\nMontgomery County Unclassifiable/Attainment\nPrince George's County Unclassifiable/Attainment\nMetropolitan Baltimore Intrastate AQCR:\nAnne Arundel County Unclassifiable/Attainment\nBaltimore County Unclassifiable/Attainment\nCity of Baltimore Unclassifiable/Attainment\nCarroll County Unclassifiable/Attainment\nHarford County Unclassifiable/Attainment\nHoward County Unclassifiable/Attainment\nAQCR 112 Central Maryland Intrastate:\nFrederick County Unclassifiable/Attainment\nAQCR 113 Cumberland-Keyser Interstate:\nAllegany County Unclassifiable/Attainment\nGarrett County Unclassifiable/Attainment\nWashington County Unclassifiable/Attainment\nAQCR 114 Eastern Shore Intrastate:\nCaroline County Unclassifiable/Attainment\nCecil County Unclassifiable/Attainment\nDorchester County Unclassifiable/Attainment\nKent County Unclassifiable/Attainment\nQueen Anne's County Unclassifiable/Attainment\nSomerset County Unclassifiable/Attainment\nTalbot County Unclassifiable/Attainment\nWicomico County Unclassifiable/Attainment\nWorcester County Unclassifiable/Attainment\nAQCR 116 Southern Maryland Intrastate:\nCalvert County Unclassifiable/Attainment\nCharles County Unclassifiable/Attainment\nSt. Mary's County Unclassifiable/Attainment\n1 Includes areas of Indian country located in each county or area, except as otherwise specified.\n2 This date is April 15, 2015, unless otherwise noted.\nMaryland—1997 24-Hour PM2.5 NAAQS\n[Primary and Secondary]\nDesignated area Designation a Classification\nDate 1 Type Date Type\nAQCR 047 National Capital Interstate (DC-MD-VA) (part):\nMontgomery County Unclassifiable/Attainment.\nPrince George's County Unclassifiable/Attainment.\nMetropolitan Baltimore Intrastate AQCR:\nAnne Arundel County Unclassifiable/Attainment.\nBaltimore County Unclassifiable/Attainment.\nCity of Baltimore Unclassifiable/Attainment.\nCarroll County Unclassifiable/Attainment.\nHarford County Unclassifiable/Attainment.\nHoward County Unclassifiable/Attainment.\nAQCR 112 Central Maryland Intrastate:\nFrederick County Unclassifiable/Attainment.\nAQCR 113 Cumberland-Keyser Interstate:\nAllegany County Unclassifiable/Attainment.\nGarrett County Unclassifiable/Attainment.\nWashington County Unclassifiable/Attainment.\nAQCR 114 Eastern Shore Intrastate:\nCaroline County Unclassifiable/Attainment.\nCecil County Unclassifiable/Attainment.\nDorchester County Unclassifiable/Attainment.\nKent County Unclassifiable/Attainment.\nQueen Anne's County Unclassifiable/Attainment.\nSomerset County Unclassifiable/Attainment.\nTalbot County Unclassifiable/Attainment.\nWicomico County Unclassifiable/Attainment.\nWorcester County Unclassifiable/Attainment.\nAQCR 116 Southern Maryland Intrastate:\nCalvert County Unclassifiable/Attainment.\nCharles County Unclassifiable/Attainment.\nSt. Mary's County Unclassifiable/Attainment.\na Includes Indian Country located in each county or area, except as otherwise specified.\n1 This date is 90 days after January 5, 2005, unless otherwise noted.\nMaryland—2006 24-Hour PM2.5 NAAQS\n[Primary and Secondary]\nDesignated area Designation a Classification\nDate 1 Type Date Type\nAQCR 047 National Capital Interstate (DC-MD-VA) (part):\nMontgomery County Unclassifiable/Attainment.\nPrince George's County Unclassifiable/Attainment.\nMetropolitan Baltimore Intrastate AQCR:\nAnne Arundel County Unclassifiable/Attainment.\nBaltimore County Unclassifiable/Attainment.\nCity of Baltimore Unclassifiable/Attainment.\nCarroll County Unclassifiable/Attainment.\nHarford County Unclassifiable/Attainment.\nHoward County Unclassifiable/Attainment.\nAQCR 112 Central Maryland Intrastate:\nFrederick County Unclassifiable/Attainment.\nAQCR 113 Cumberland-Keyser Interstate:\nAllegany County Unclassifiable/Attainment.\nGarrett County Unclassifiable/Attainment.\nWashington County Unclassifiable/Attainment.\nAQCR 114 Eastern Shore Intrastate:\nCaroline County Unclassifiable/Attainment.\nCecil County Unclassifiable/Attainment.\nDorchester County Unclassifiable/Attainment.\nKent County Unclassifiable/Attainment.\nQueen Anne's County Unclassifiable/Attainment.\nSomerset County Unclassifiable/Attainment.\nTalbot County Unclassifiable/Attainment.\nWicomico County Unclassifiable/Attainment.\nWorcester County Unclassifiable/Attainment.\nAQCR 116 Southern Maryland Intrastate:\nCalvert County Unclassifiable/Attainment.\nCharles County Unclassifiable/Attainment.\nSt. Mary's County Unclassifiable/Attainment.\na Includes Indian Country located in each county or area, except as otherwise specified.\n1 This date is 30 days after November 13, 2009, unless otherwise noted.\nMaryland—NO2 (1971 Annual Standard)\nDesignated area Does not meet primary standards Cannot be classified or better than national standards\nState of Maryland X\nMaryland—NO2 (2010 1-Hour Standard)\nDesignated area Designation a\nDate 1 Type\nAllegany County Unclassifiable/Attainment.\nAnne Arundel County Unclassifiable/Attainment.\nBaltimore County Unclassifiable/Attainment.\nCity of Baltimore Unclassifiable/Attainment.\nCalvert County Unclassifiable/Attainment.\nCaroline County Unclassifiable/Attainment.\nCarroll County Unclassifiable/Attainment.\nCecil County Unclassifiable/Attainment.\nCharles County Unclassifiable/Attainment.\nDorchester County Unclassifiable/Attainment.\nFrederick County Unclassifiable/Attainment.\nGarrett County Unclassifiable/Attainment.\nHarford County Unclassifiable/Attainment.\nHoward County Unclassifiable/Attainment.\nKent County Unclassifiable/Attainment.\nMontgomery County Unclassifiable/Attainment.\nPrince George's County Unclassifiable/Attainment.\nQueene Anne's County Unclassifiable/Attainment.\nSt. Mary's County Unclassifiable/Attainment.\nSomerset County Unclassifiable/Attainment.\nTalbot County Unclassifiable/Attainment.\nWashington County Unclassifiable/Attainment.\nWicomico County Unclassifiable/Attainment.\nWorchester County Unclassifiable/Attainment.\na Includes Indian Country located in each county or area, except as otherwise specified.\n1 This date is 90 days after October 31, 2011, unless otherwise noted.\nMaryland—1997 8-Hour Ozone NAAQS\n[Primary and Secondary]\nDesignated area Designation a Category/classification\nDate 1 Type Date 1 Type\nBaltimore, MD:\nAnne Arundel County Nonattainment (5) Subpart 2/Serious.4\nCity of Baltimore Nonattainment (5) Subpart 2/Serious.4\nBaltimore County Nonattainment (5) Subpart 2/Serious.4\nCarroll County Nonattainment (5) Subpart 2/Serious.4\nHarford County Nonattainment (5) Subpart 2/Serious.4\nHoward County Nonattainment (5) Subpart 2/Serious.4\nKent and Queen Anne's Area\nKent County 1/22/2007 Attainment\nQueen Anne's County 1/22/2007 Attainment\nWashington County (Hagerstown), MD:\nWashington County (2) Attainment.\nPhiladelphia-Wilmin-Atlantic Ci, PA-NJ-MD-DE:\nCecil County Nonattainment Subpart 2/Moderate.4\nWashington, DC-MD-VA:\nCalvert County Nonattainment Subpart 2/Moderate.\nCharles County Nonattainment Subpart 2/Moderate.\nFrederick County Nonattainment Subpart 2/Moderate.\nMontgomery County Nonattainment Subpart 2/Moderate.\nPrince George's County Nonattainment Subpart 2/Moderate.\nAQCR 113 Cumberland-Keyser Interstate Unclassifiable/Attainment\nAllegany County\nGarrett County\nAQCR 114 Eastern Shore Interstate (remainder of) Unclassifiable/Attainment\nCaroline County\nDorchester County\nSomerset County\nTalbot County\nWicomico County\nWorcester County\nAQCR 116 Southern Maryland Intrastate (remainder of) Unclassifiable/Attainment\nSt. Mary's County\na Includes Indian Country located in each county or area, except as otherwise specified.\n1 This date is June 15, 2004, unless otherwise noted.\n2 Effective April 15, 2008.\n3 November 22, 2004.\n4 Attainment date is June 15, 2013.\n5 Effective March 2, 2012.\nMaryland—2008 8-Hour Ozone NAAQS\n[Primary and Secondary]\nDesignated area Designation Classification\nDate 1 Type Date 1 Type\nBaltimore, MD: 2 Nonattainment Moderate.\nAnne Arundel County\nBaltimore County\nBaltimore City\nCarroll County\nHarford County\nHoward County\nCecil County 2 7/6/2026 Nonattainment 6/3/2016 Marginal.4\nCecil County\nWashington, DC-MD-VA: 2 April 15, 2019 Attainment\nCalvert County 4/15/2019 Attainment\nCharles County 4/15/2019 Attainment\nFrederick County 4/15/2019 Attainment\nMontgomery County 4/15/2019 Attainment\nPrince George's County 4/15/2019 Attainment\nAQCR 113 Cumberland-Keyser Interstate 3 Unclassifiable/Attainment\nAllegany County\nGarrett County\nWashington County\nAQCR 114 Eastern Shore Interstate: (remainder) 3 Unclassifiable/Attainment\nCaroline County\nDorchester County\nKent County\nQueen Anne's County\nSomerset County\nTalbot County\nWicomico County\nWorcester County\nAQCR 116 Southern Maryland Intrastate: (remainder) 3 Unclassifiable/Attainment\nSt. Mary's County\n1 This date is July 20, 2012, unless otherwise noted.\n2 Excludes Indian country located in each area, unless otherwise noted.\n3 Includes any Indian country in each county or area, unless otherwise specified.\n4 Attainment date is extended to July 20, 2016.\nMaryland—2015 8-Hour Ozone NAAQS\n[Primary and Secondary]\nDesignated area 1 Designation Classification\nDate 2 Type Date 2 Type\nBaltimore, MD Nonattainment 8/1/2024 Serious.\nAnne Arundel County.\nBaltimore County.\nCarroll County.\nHarford County.\nHoward County.\nCity of Baltimore.\nCecil County. 7/6/2026 Nonattainment 7/30/2024 Serious.\nWashington, DC-MD-VA Nonattainment 11/7/2022 Moderate.\nCalvert County.\nCharles County.\nFredrick County.\nMontgomery County.\nPrince George's County.\nAllegany County 1/16/2018 Attainment/Unclassifiable\nCaroline County 1/16/2018 Attainment/Unclassifiable\nDorchester County Attainment/Unclassifiable\nGarrett County 1/16/2018 Attainment/Unclassifiable\nKent County Attainment/Unclassifiable\nQueen Anne's County Attainment/Unclassifiable\nSt. Mary's County Attainment/Unclassifiable\nSomerset County 1/16/2018 Attainment/Unclassifiable\nTalbot County Attainment/Unclassifiable\nWashington County Attainment/Unclassifiable\nWicomico County 1/16/2018 Attainment/Unclassifiable\nWorcester County 1/16/2018 Attainment/Unclassifiable\n1 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.\n2 This date is August 3, 2018, unless otherwise noted.\nMaryland—2008 Lead NAAQS\nDesignated area Designation for the 2008 NAAQS a\nDate 1 Type\nWhole State Unclassifiable/Attainment.\na Includes Indian Country located in each county or area, except as otherwise specified.\n1 December 31, 2011 unless otherwise noted.","path":["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"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"d9a02435587359bf889f3ed057d5a9273daafb1532011e7805abc49a62ddef1a","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-81.320","next":"us/40-cfr-81.322"},"notice":"GroundRules: Original legal text. Not legal advice."}