{"data":{"id":"us/40-cfr-81.307","jurisdiction":"us","citation":"40 CFR 81.307","heading":"Connecticut.","body":"Connecticut—TSP\nDesignated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards\nAQCR 41 X\nAQCR 42 X\nAQCR 43 X\nAQCR 44 X\nConnecticut—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\nAQCR 41 X\nAQCR 42 X\nAQCR 43 X\nAQCR 44 X\nConnecticut—2010 Sulfur Dioxide NAAQS\n[Primary]\nDesignated area 1 Designation\nDate 2 Type\nState of Connecticut 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.\nConnecticut—Carbon Monoxide\nDesignated area Designation Classification\nDate 1 Type Date 1 Type\nHartford-New Britain-Middletown Area:\nHartford County (part) 1/2/1996 Attainment\nBristol City, Burlington Town, Avon Town, Bloomfield Town, Canton Town, E. Granby Town, E. Hartford Town, E. Windsor Town, Enfield Town, Farmington Town, Glastonbury Town, Granby Town, Hartford city, Manchester Town, Marlborough Town, Newington Town, Rocky Hill Town, Simsbury Town, S. Windsor Town, Suffield Town, W. Hartford Town, Wethersfield Town, Windsor Town, Windsor Locks Town, Berlin Town, New Britain city, Plainville Town, and Southington Town\nLitchfield County (part) 1/2/1996 Attainment\nPlymouth Town\nMiddlesex County (part) 1/2/1996 Attainment\nCromwell Town, Durham Town, E. Hampton Town, Haddam Town, Middlefield Town, Middletown City, Portland Town, E. Haddam Town\nTolland County (part) 1/2/1996 Attainment\nAndover Town, Bolton Town, Ellington Town, Hebron Town, Somers Town, Tolland Town, and Vernon Town\nNew Haven—Meriden—Waterbury Area:\nFairfield County (part) 12/4/1998 Attainment\nShelton City\nLitchfield County (part) 12/4/1998 Attainment\nBethlehem Town, Thomaston Town, Watertown, Woodbury Town\nNew Haven County 12/4/1998 Attainment\nNew York-N. ew Jersey-Long Island Area:\nFairfield County (part) 5/10/1999 Attainment\nAll cities and townships except Shelton City\nLitchfield County (part) 5/10/1999 Attainment\nBridgewater Town, New Milford Town\nAQCR 041 Eastern Connecticut Intrastate Unclassifiable/Attainment\nMiddlesex County (part)\nAll portions except cities and towns in Hartford Area\nNew London County\nTolland County (part)\nAll portions except cities and towns in Hartford Area\nWindham County\nAQCR 044 Northwestern Connecticut Intrastate Unclassifiable/Attainment\nHartford County (part) Hartland Township\nLitchfield County (part)\nAll portions except cities and towns in Hartford, New Haven, and New York Areas\n1 This date is November 15, 1990, unless otherwise noted.\nConnecticut—Ozone (1-Hour Standard)2\nDesignated area Designation Classification\nDate 1 Type Date 1 Type\nGreater Connecticut Area:\nFairfield County (part) Nonattainment Serious.\nShelton City\nHartford County Nonattainment Serious.\nLitchfield County (part) Nonattainment Serious.\nall cities and townships except: Bridgewater Town, New Milford Town\nMiddlesex County Nonattainment Serious.\nNew Haven County Nonattainment Serious.\nNew London County Nonattainment Serious.\nTolland County Nonattainment Serious.\nWindham County Nonattainment Serious.\nNew York—N. New Jersey-Long Island Area:\nFairfield County (part) Nonattainment Severe-17.\nall cities and towns except Shelton City\nLitchfield County (part) Nonattainment Severe-17.\nBridgewater Town, New Milford Town\n1 This date is November 15, 1990, unless otherwise noted.\n2 The 1-hour ozone standard is revoked effective June 15, 2005 for all areas in Connecticut.\nConnecticut—PM-10\nDesignated Area Designation Classification\nDate Type Date Type\nNew Haven County\nCity of New Haven 12/12/2005 Attainment\nRest of State 11/15/1990 Unclassifiable\nConnecticut—1997 Annual PM2.5 NAAQS\n[Primary and Secondary]\nDesignated area Designationa Classification\nDate1 Type Date Type\nNew York-N. New Jersey-Long Island, NY-NJ-CT:\nFairfield County 10/24/2013 Attainment.\nNew Haven County 10/24/2013 Attainment.\nRest of State:\nHartford County Unclassifiable/Attainment.\nLitchfield County Unclassifiable/Attainment.\nMiddlesex County Unclassifiable/Attainment.\nNew London County Unclassifiable/Attainment.\nTolland County Unclassifiable/Attainment.\nWindham 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.\nConnecticut—2012 Annual PM2.5 NAAQS\n[Primary]\nDesignated area 1 Designation Classification\nDate 2 Type Date 2 Type\nStatewide:\nFairfield County Unclassifiable/Attainment\nHartford County Unclassifiable/Attainment\nLitchfield County Unclassifiable/Attainment\nMiddlesex County Unclassifiable/Attainment\nNew Haven County Unclassifiable/Attainment\nNew London County Unclassifiable/Attainment\nTolland County Unclassifiable/Attainment\nWindham 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.\nConnecticut—1997 24-Hour PM2.5 NAAQS\n[Primary and Secondary]\nDesignated area Designationa Classification\nDate1 Type Date Type\nNew York-N. New Jersey-Long Island, NY-NJ-CT:\nFairfield County Unclassifiable/Attainment\nNew Haven County Unclassifiable/Attainment\nRest of State:\nHartford County Unclassifiable/Attainment\nLitchfield County Unclassifiable/Attainment\nMiddlesex County Unclassifiable/Attainment\nNew London County Unclassifiable/Attainment\nTolland County Unclassifiable/Attainment\nWindham 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\nConnecticut—2006 24-Hour PM2.5 NAAQS\n[Primary and Secondary]\nDesignated area Designationa Classification\nDate1 Type Date Type\nNew York-N. New Jersey-Long Island, NY-NJ-CT:\nFairfield County 10/24/2013 Attainment.\nNew Haven County 10/24/2013 Attainment.\nRest of State:\nHartford County Unclassifiable/Attainment\nLitchfield County Unclassifiable/Attainment\nMiddlesex County Unclassifiable/Attainment\nNew London County Unclassifiable/Attainment\nTolland County Unclassifiable/Attainment\nWindham 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.\nConnecticut—NO2 (1971 Annual Standard)\nDesignated area Does not meet primary standards Cannot be classified or better than national standards\nAQCR 41 X\nAQCR 42 X\nAQCR 43 X\nAQCR 44 X\nConnecticut—NO2 (2010 1-Hour Standard)\nDesignated area Designation a\nDate 1 Type\nState of Connecticut 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.\nConnecticut—1997 8-Hour Ozone NAAQS\n[Primary and Secondary]\nDesignated area Designation a Category/classification\nDate 1 Type Date 1 Type\nGreater Connecticut, CT:\nHartford County Nonattainment Subpart 2/Moderate.\nLitchfield County Nonattainment Subpart 2/Moderate.\nNew London County Nonattainment Subpart 2/Moderate.\nTolland County Nonattainment Subpart 2/Moderate.\nWindham County Nonattainment Subpart 2/Moderate.\nNew York-N. New Jersey-Long Island, NY-NJ-CT:\nFairfield County Nonattainment Subpart 2/Moderate.\nMiddlesex County Nonattainment Subpart 2/Moderate.\nNew Haven County Nonattainment Subpart 2/Moderate.\na Includes Indian Country located in each county or area, except as otherwise specified.\n1 This date is June 15, 2004, unless otherwise noted.\nConnecticut—2008 8-Hour Ozone NAAQS\n[Primary and Secondary]\nDesignated area Designation Classification\nDate 1 Type Date 1 Type\nGreater Connecticut, CT: 2 Nonattainment 9/23/2019 Serious.\nHartford County\nLitchfield County\nNew London County\nTolland County\nWindham County\nMashantucket Pequot Tribe of Connecticut 3\nMohegan Indian Tribe of Connecticut 3\nNew York-N. New Jersey-Long Island, NY-NJ-CT: 2 Nonattainment 11/7/2022 Severe.\nFairfield County\nMiddlesex County\nNew Haven County\n1 This date is July 20, 2012, unless otherwise noted.\n2 Excludes Indian country located in each area, unless otherwise noted.\n3 Includes Indian country of the tribe listed in this table located in the identified area. Information pertaining to areas of Indian country in this table is intended for CAA 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.\nConnecticut—2015 8-Hour Ozone NAAQS\n[Primary and secondary]\nDesignated area 1 Designation Classification\nDate 2 Type Date 2 Type\nGreater Connecticut, CT Nonattainment 7/29/2024 Serious.\nHartford County\nLitchfield County\nNew London County\nTolland County\nWindham County\nMashantucket Pequot 5/26/2026 Serious.\nTribal Nation 5/26/2026\nMohegan Indian Tribe\nNew York-N New Jersey-Long Island, NY-NJ-CT Nonattainment\nFairfield County Serious.\nMiddlesex County Serious.\nNew Haven County\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.\nConnecticut—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":"e1f159a7c510dbe7d6751c1230cda98c18c45df43ce23842564bdb2db63e50d3","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-81.306","next":"us/40-cfr-81.308"},"notice":"GroundRules: Original legal text. Not legal advice."}