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8-Hour Ozone (1997) Nonattainment Areas by State/County/Area - NAAQS Revoked
8-Hour Ozone (1997) Nonattainment Areas by State/County/Area - NAAQS Revoked
Data is current as of June 30, 2024The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).
Click underlined column heading to change report order
| State | County | Area Name | County NA Whole/Part |
2010 Population |
State/ County FIPS |
|---|---|---|---|---|---|
| click link for partial county description |
whole or partial county population |
||||
| CALIFORNIA | Alameda County | San Francisco Bay Area, CA | Whole | 1,510,271 | 06/001 |
| CALIFORNIA | Amador County | Amador and Calaveras Cos. (Central Mountain Cos.), CA | Whole | 38,091 | 06/005 |
| CALIFORNIA | Butte County | Chico, CA | Whole | 220,000 | 06/007 |
| CALIFORNIA | Calaveras County | Amador and Calaveras Cos. (Central Mountain Cos.), CA | Whole | 45,578 | 06/009 |
| CALIFORNIA | Contra Costa County | San Francisco Bay Area, CA | Whole | 1,049,025 | 06/013 |
| CALIFORNIA | El Dorado County | Sacramento Metro, CA | Part | 151,823 | 06/017 |
| CALIFORNIA | Fresno County | San Joaquin Valley, CA | Whole | 930,450 | 06/019 |
| CALIFORNIA | Imperial County | Imperial County, CA | Whole | 174,528 | 06/025 |
| CALIFORNIA | Kern County | Kern County (Eastern Kern), CA | Part | 95,314 | 06/029 |
| CALIFORNIA | Kern County | San Joaquin Valley, CA | Part | 710,558 | 06/029 |
| CALIFORNIA | Kings County | San Joaquin Valley, CA | Whole | 152,982 | 06/031 |
| CALIFORNIA | Los Angeles County | Los Angeles and San Bernardino Counties (Western Mojave Desert), CA | Part | 378,570 | 06/037 |
| CALIFORNIA | Los Angeles County | Los Angeles-South Coast Air Basin, CA | Part | 9,441,036 | 06/037 |
| CALIFORNIA | Madera County | San Joaquin Valley, CA | Whole | 150,865 | 06/039 |
| CALIFORNIA | Marin County | San Francisco Bay Area, CA | Whole | 252,409 | 06/041 |
| CALIFORNIA | Mariposa County | Mariposa and Tuolumne Cos. (Southern Mountain Counties), CA | Whole | 18,251 | 06/043 |
| CALIFORNIA | Merced County | San Joaquin Valley, CA | Whole | 255,793 | 06/047 |
| CALIFORNIA | Napa County | San Francisco Bay Area, CA | Whole | 136,484 | 06/055 |
| CALIFORNIA | Nevada County | Nevada County (Western part), CA | Part | 82,393 | 06/057 |
| CALIFORNIA | Orange County | Los Angeles-South Coast Air Basin, CA | Whole | 3,010,232 | 06/059 |
| CALIFORNIA | Placer County | Sacramento Metro, CA | Part | 339,500 | 06/061 |
| CALIFORNIA | Riverside County | Los Angeles-South Coast Air Basin, CA | Part | 1,737,296 | 06/065 |
| CALIFORNIA | Riverside County | Morongo Band of Mission Indians, CA | Part | 913 | 06/065 |
| CALIFORNIA | Riverside County | Riverside County (Coachella Valley), CA | Part | 425,425 | 06/065 |
| CALIFORNIA | Sacramento County | Sacramento Metro, CA | Whole | 1,418,788 | 06/067 |
| CALIFORNIA | San Bernardino County | Los Angeles and San Bernardino Counties (Western Mojave Desert), CA | Part | 489,780 | 06/071 |
| CALIFORNIA | San Bernardino County | Los Angeles-South Coast Air Basin, CA | Part | 1,526,620 | 06/071 |
| CALIFORNIA | San Francisco County | San Francisco Bay Area, CA | Whole | 805,235 | 06/075 |
| CALIFORNIA | San Joaquin County | San Joaquin Valley, CA | Whole | 685,306 | 06/077 |
| CALIFORNIA | San Mateo County | San Francisco Bay Area, CA | Whole | 718,451 | 06/081 |
| CALIFORNIA | Santa Clara County | San Francisco Bay Area, CA | Whole | 1,781,642 | 06/085 |
| CALIFORNIA | Solano County | Sacramento Metro, CA | Part | 129,518 | 06/095 |
| CALIFORNIA | Solano County | San Francisco Bay Area, CA | Part | 284,218 | 06/095 |
| CALIFORNIA | Sonoma County | San Francisco Bay Area, CA | Part | 433,262 | 06/097 |
| CALIFORNIA | Stanislaus County | San Joaquin Valley, CA | Whole | 514,453 | 06/099 |
| CALIFORNIA | Sutter County | Sacramento Metro, CA | Part | 3,433 | 06/101 |
| CALIFORNIA | Sutter County | Sutter County (part) (Sutter Buttes), CA | Part | 33 | 06/101 |
| CALIFORNIA | Tulare County | San Joaquin Valley, CA | Whole | 442,179 | 06/107 |
| CALIFORNIA | Tuolumne County | Mariposa and Tuolumne Cos. (Southern Mountain Counties), CA | Whole | 55,365 | 06/109 |
| CALIFORNIA | Ventura County | Ventura County (part), CA | Part | 823,360 | 06/111 |
| CALIFORNIA | Yolo County | Sacramento Metro, CA | Whole | 200,849 | 06/113 |
| COLORADO | Adams County | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO | Whole | 441,603 | 08/001 |
| COLORADO | Arapahoe County | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO | Whole | 572,003 | 08/005 |
| COLORADO | Boulder County | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO | Whole | 294,567 | 08/013 |
| COLORADO | Broomfield County | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO | Whole | 55,889 | 08/014 |
| COLORADO | Denver County | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO | Whole | 600,158 | 08/031 |
| COLORADO | Douglas County | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO | Whole | 285,465 | 08/035 |
| COLORADO | Jefferson County | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO | Whole | 534,543 | 08/059 |
| COLORADO | Larimer County | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO | Part | 294,389 | 08/069 |
| COLORADO | Weld County | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO | Part | 251,522 | 08/123 |
| CONNECTICUT | Fairfield County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 916,829 | 09/001 |
| CONNECTICUT | Hartford County | Greater Connecticut, CT | Whole | 894,014 | 09/003 |
| CONNECTICUT | Litchfield County | Greater Connecticut, CT | Whole | 189,927 | 09/005 |
| CONNECTICUT | Middlesex County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 165,676 | 09/007 |
| CONNECTICUT | New Haven County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 862,477 | 09/009 |
| CONNECTICUT | New London County | Greater Connecticut, CT | Whole | 274,055 | 09/011 |
| CONNECTICUT | Tolland County | Greater Connecticut, CT | Whole | 152,691 | 09/013 |
| CONNECTICUT | Windham County | Greater Connecticut, CT | Whole | 118,428 | 09/015 |
| DELAWARE | Kent County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 162,310 | 10/001 |
| DELAWARE | New Castle County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 538,479 | 10/003 |
| DELAWARE | Sussex County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 197,145 | 10/005 |
| DISTRICT OF COLUMBIA | District of Columbia | Washington, DC-MD-VA | Whole | 601,723 | 11/001 |
| MARYLAND | Anne Arundel County | Baltimore, MD | Whole | 537,656 | 24/003 |
| MARYLAND | Baltimore County | Baltimore, MD | Whole | 805,029 | 24/005 |
| MARYLAND | Baltimore city | Baltimore, MD | Whole | 620,961 | 24/510 |
| MARYLAND | Calvert County | Washington, DC-MD-VA | Whole | 88,737 | 24/009 |
| MARYLAND | Carroll County | Baltimore, MD | Whole | 167,134 | 24/013 |
| MARYLAND | Cecil County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 101,108 | 24/015 |
| MARYLAND | Charles County | Washington, DC-MD-VA | Whole | 146,551 | 24/017 |
| MARYLAND | Frederick County | Washington, DC-MD-VA | Whole | 233,385 | 24/021 |
| MARYLAND | Harford County | Baltimore, MD | Whole | 244,826 | 24/025 |
| MARYLAND | Howard County | Baltimore, MD | Whole | 287,085 | 24/027 |
| MARYLAND | Montgomery County | Washington, DC-MD-VA | Whole | 971,777 | 24/031 |
| MARYLAND | Prince George's County | Washington, DC-MD-VA | Whole | 863,420 | 24/033 |
| MASSACHUSETTS | Barnstable County | Boston-Lawrence-Worcester (E. Mass), MA | Whole | 215,888 | 25/001 |
| MASSACHUSETTS | Berkshire County | Springfield (W. Mass), MA | Whole | 131,219 | 25/003 |
| MASSACHUSETTS | Bristol County | Boston-Lawrence-Worcester (E. Mass), MA | Whole | 548,285 | 25/005 |
| MASSACHUSETTS | Dukes County | Boston-Lawrence-Worcester (E. Mass), MA | Whole | 16,535 | 25/007 |
| MASSACHUSETTS | Essex County | Boston-Lawrence-Worcester (E. Mass), MA | Whole | 743,159 | 25/009 |
| MASSACHUSETTS | Franklin County | Springfield (W. Mass), MA | Whole | 71,372 | 25/011 |
| MASSACHUSETTS | Hampden County | Springfield (W. Mass), MA | Whole | 463,490 | 25/013 |
| MASSACHUSETTS | Hampshire County | Springfield (W. Mass), MA | Whole | 158,080 | 25/015 |
| MASSACHUSETTS | Middlesex County | Boston-Lawrence-Worcester (E. Mass), MA | Whole | 1,503,085 | 25/017 |
| MASSACHUSETTS | Nantucket County | Boston-Lawrence-Worcester (E. Mass), MA | Whole | 10,172 | 25/019 |
| MASSACHUSETTS | Norfolk County | Boston-Lawrence-Worcester (E. Mass), MA | Whole | 670,850 | 25/021 |
| MASSACHUSETTS | Plymouth County | Boston-Lawrence-Worcester (E. Mass), MA | Whole | 494,919 | 25/023 |
| MASSACHUSETTS | Suffolk County | Boston-Lawrence-Worcester (E. Mass), MA | Whole | 722,023 | 25/025 |
| MASSACHUSETTS | Worcester County | Boston-Lawrence-Worcester (E. Mass), MA | Whole | 798,552 | 25/027 |
| NEW JERSEY | Atlantic County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 274,549 | 34/001 |
| NEW JERSEY | Bergen County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 905,116 | 34/003 |
| NEW JERSEY | Burlington County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 448,734 | 34/005 |
| NEW JERSEY | Camden County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 513,657 | 34/007 |
| NEW JERSEY | Cape May County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 97,265 | 34/009 |
| NEW JERSEY | Cumberland County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 156,898 | 34/011 |
| NEW JERSEY | Essex County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 783,969 | 34/013 |
| NEW JERSEY | Gloucester County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 288,288 | 34/015 |
| NEW JERSEY | Hudson County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 634,266 | 34/017 |
| NEW JERSEY | Hunterdon County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 128,349 | 34/019 |
| NEW JERSEY | Mercer County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 366,513 | 34/021 |
| NEW JERSEY | Middlesex County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 809,858 | 34/023 |
| NEW JERSEY | Monmouth County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 630,380 | 34/025 |
| NEW JERSEY | Morris County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 492,276 | 34/027 |
| NEW JERSEY | Ocean County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 576,567 | 34/029 |
| NEW JERSEY | Passaic County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 501,226 | 34/031 |
| NEW JERSEY | Salem County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 66,083 | 34/033 |
| NEW JERSEY | Somerset County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 323,444 | 34/035 |
| NEW JERSEY | Sussex County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 149,265 | 34/037 |
| NEW JERSEY | Union County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 536,499 | 34/039 |
| NEW JERSEY | Warren County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 108,692 | 34/041 |
| NEW YORK | Albany County | Albany-Schenectady-Troy, NY | Whole | 304,204 | 36/001 |
| NEW YORK | Bronx County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 1,385,108 | 36/005 |
| NEW YORK | Chautauqua County | Jamestown, NY | Whole | 134,905 | 36/013 |
| NEW YORK | Dutchess County | Poughkeepsie, NY | Whole | 297,488 | 36/027 |
| NEW YORK | Erie County | Buffalo-Niagara Falls, NY | Whole | 919,040 | 36/029 |
| NEW YORK | Essex County | Essex County (Whiteface Mtn.), NY | Part | 465 | 36/031 |
| NEW YORK | Genesee County | Rochester, NY | Whole | 60,079 | 36/037 |
| NEW YORK | Greene County | Albany-Schenectady-Troy, NY | Whole | 49,221 | 36/039 |
| NEW YORK | Jefferson County | Jefferson County, NY | Whole | 116,229 | 36/045 |
| NEW YORK | Kings County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 2,504,700 | 36/047 |
| NEW YORK | Livingston County | Rochester, NY | Whole | 65,393 | 36/051 |
| NEW YORK | Monroe County | Rochester, NY | Whole | 744,344 | 36/055 |
| NEW YORK | Montgomery County | Albany-Schenectady-Troy, NY | Whole | 50,219 | 36/057 |
| NEW YORK | Nassau County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 1,339,532 | 36/059 |
| NEW YORK | New York County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 1,585,873 | 36/061 |
| NEW YORK | Niagara County | Buffalo-Niagara Falls, NY | Whole | 216,469 | 36/063 |
| NEW YORK | Ontario County | Rochester, NY | Whole | 107,931 | 36/069 |
| NEW YORK | Orange County | Poughkeepsie, NY | Whole | 372,813 | 36/071 |
| NEW YORK | Orleans County | Rochester, NY | Whole | 42,883 | 36/073 |
| NEW YORK | Putnam County | Poughkeepsie, NY | Whole | 99,710 | 36/079 |
| NEW YORK | Queens County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 2,230,722 | 36/081 |
| NEW YORK | Rensselaer County | Albany-Schenectady-Troy, NY | Whole | 159,429 | 36/083 |
| NEW YORK | Richmond County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 468,730 | 36/085 |
| NEW YORK | Rockland County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 311,687 | 36/087 |
| NEW YORK | Saratoga County | Albany-Schenectady-Troy, NY | Whole | 219,607 | 36/091 |
| NEW YORK | Schenectady County | Albany-Schenectady-Troy, NY | Whole | 154,727 | 36/093 |
| NEW YORK | Schoharie County | Albany-Schenectady-Troy, NY | Whole | 32,749 | 36/095 |
| NEW YORK | Suffolk County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 1,493,350 | 36/103 |
| NEW YORK | Wayne County | Rochester, NY | Whole | 93,772 | 36/117 |
| NEW YORK | Westchester County | New York-N. New Jersey-Long Island, NY-NJ-CT | Whole | 949,113 | 36/119 |
| PENNSYLVANIA | Allegheny County | Pittsburgh-Beaver Valley, PA | Whole | 1,223,348 | 42/003 |
| PENNSYLVANIA | Armstrong County | Pittsburgh-Beaver Valley, PA | Whole | 68,941 | 42/005 |
| PENNSYLVANIA | Beaver County | Pittsburgh-Beaver Valley, PA | Whole | 170,539 | 42/007 |
| PENNSYLVANIA | Bucks County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 625,249 | 42/017 |
| PENNSYLVANIA | Butler County | Pittsburgh-Beaver Valley, PA | Whole | 183,862 | 42/019 |
| PENNSYLVANIA | Chester County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 498,886 | 42/029 |
| PENNSYLVANIA | Delaware County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 558,979 | 42/045 |
| PENNSYLVANIA | Fayette County | Pittsburgh-Beaver Valley, PA | Whole | 136,606 | 42/051 |
| PENNSYLVANIA | Montgomery County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 799,874 | 42/091 |
| PENNSYLVANIA | Philadelphia County | Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE | Whole | 1,526,006 | 42/101 |
| PENNSYLVANIA | Washington County | Pittsburgh-Beaver Valley, PA | Whole | 207,820 | 42/125 |
| PENNSYLVANIA | Westmoreland County | Pittsburgh-Beaver Valley, PA | Whole | 365,169 | 42/129 |
| RHODE ISLAND | Bristol County | Providence (all of RI), RI | Whole | 49,875 | 44/001 |
| RHODE ISLAND | Kent County | Providence (all of RI), RI | Whole | 166,158 | 44/003 |
| RHODE ISLAND | Newport County | Providence (all of RI), RI | Whole | 82,888 | 44/005 |
| RHODE ISLAND | Providence County | Providence (all of RI), RI | Whole | 626,667 | 44/007 |
| RHODE ISLAND | Washington County | Providence (all of RI), RI | Whole | 126,979 | 44/009 |
| TEXAS | Brazoria County | Houston-Galveston-Brazoria, TX | Whole | 313,166 | 48/039 |
| TEXAS | Chambers County | Houston-Galveston-Brazoria, TX | Whole | 35,096 | 48/071 |
| TEXAS | Collin County | Dallas-Fort Worth, TX | Whole | 782,341 | 48/085 |
| TEXAS | Dallas County | Dallas-Fort Worth, TX | Whole | 2,368,139 | 48/113 |
| TEXAS | Denton County | Dallas-Fort Worth, TX | Whole | 662,614 | 48/121 |
| TEXAS | Ellis County | Dallas-Fort Worth, TX | Whole | 149,610 | 48/139 |
| TEXAS | Fort Bend County | Houston-Galveston-Brazoria, TX | Whole | 585,375 | 48/157 |
| TEXAS | Galveston County | Houston-Galveston-Brazoria, TX | Whole | 291,309 | 48/167 |
| TEXAS | Harris County | Houston-Galveston-Brazoria, TX | Whole | 4,092,459 | 48/201 |
| TEXAS | Johnson County | Dallas-Fort Worth, TX | Whole | 150,934 | 48/251 |
| TEXAS | Kaufman County | Dallas-Fort Worth, TX | Whole | 103,350 | 48/257 |
| TEXAS | Liberty County | Houston-Galveston-Brazoria, TX | Whole | 75,643 | 48/291 |
| TEXAS | Montgomery County | Houston-Galveston-Brazoria, TX | Whole | 455,746 | 48/339 |
| TEXAS | Parker County | Dallas-Fort Worth, TX | Whole | 116,927 | 48/367 |
| TEXAS | Rockwall County | Dallas-Fort Worth, TX | Whole | 78,337 | 48/397 |
| TEXAS | Tarrant County | Dallas-Fort Worth, TX | Whole | 1,809,034 | 48/439 |
| TEXAS | Waller County | Houston-Galveston-Brazoria, TX | Whole | 43,205 | 48/473 |
| VIRGINIA | Alexandria city | Washington, DC-MD-VA | Whole | 139,966 | 51/510 |
| VIRGINIA | Arlington County | Washington, DC-MD-VA | Whole | 207,627 | 51/013 |
| VIRGINIA | Fairfax County | Washington, DC-MD-VA | Whole | 1,081,726 | 51/059 |
| VIRGINIA | Fairfax city | Washington, DC-MD-VA | Whole | 22,565 | 51/600 |
| VIRGINIA | Falls Church city | Washington, DC-MD-VA | Whole | 12,332 | 51/610 |
| VIRGINIA | Loudoun County | Washington, DC-MD-VA | Whole | 312,311 | 51/107 |
| VIRGINIA | Manassas Park city | Washington, DC-MD-VA | Whole | 14,273 | 51/685 |
| VIRGINIA | Manassas city | Washington, DC-MD-VA | Whole | 37,821 | 51/683 |
| VIRGINIA | Prince William County | Washington, DC-MD-VA | Whole | 402,002 | 51/153 |
| WISCONSIN | Sheboygan County | Inland Sheboygan County, WI | Part | 53,851 | 55/117 |
| WISCONSIN | Sheboygan County | Shoreline Sheboygan County, WI | Part | 61,656 | 55/117 |
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