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8-Hour Ozone (1997) Nonattainment Area State/Area/County Report - NAAQS Revoked
8-Hour Ozone (1997) Nonattainment Area State/Area/County Report - NAAQS Revoked
Data is current as of March 31, 2024View Notes
Area Name (Category/Classification) (P) Partial County
| CALIFORNIA (Region IX) | |
| Amador and Calaveras Cos. (Central Mountain Cos.), CA (Moderate - Nonattainment) | |
| Amador County | |
| Calaveras County | |
| Chico, CA (Marginal - Nonattainment) | |
| Butte County | |
| Imperial County, CA (Moderate - Nonattainment) | |
| Imperial County | |
| Kern County (Eastern Kern), CA (Moderate - Nonattainment) | |
| Kern County (P) | |
| Los Angeles and San Bernardino Counties (Western Mojave Desert), CA (Severe 15 - Nonattainment) | |
| Los Angeles County (P) | |
| San Bernardino County (P) | |
| Los Angeles-South Coast Air Basin, CA (Extreme - Nonattainment) | |
| Los Angeles County (P) | |
| Orange County | |
| Riverside County (P) | |
| San Bernardino County (P) | |
| Mariposa and Tuolumne Cos. (Southern Mountain Counties), CA (Moderate - Nonattainment) | |
| Mariposa County | |
| Tuolumne County | |
| Morongo Band of Mission Indians, CA (Severe 17 - Nonattainment) | |
| Riverside County (P) | |
| Nevada County (Western part), CA (Moderate - Nonattainment) | |
| Nevada County (P) | |
| Riverside County (Coachella Valley), CA (Extreme - Nonattainment) | |
| Riverside County (P) | |
| Sacramento Metro, CA (Severe 15 - Nonattainment) | |
| El Dorado County (P) | |
| Placer County (P) | |
| Sacramento County | |
| Solano County (P) | |
| Sutter County (P) | |
| Yolo County | |
| San Francisco Bay Area, CA (Marginal - Nonattainment) | |
| Alameda County | |
| Contra Costa County | |
| Marin County | |
| Napa County | |
| San Francisco County | |
| San Mateo County | |
| Santa Clara County | |
| Solano County (P) | |
| Sonoma County (P) | |
| San Joaquin Valley, CA (Extreme - Nonattainment) | |
| Fresno County | |
| Kern County (P) | |
| Kings County | |
| Madera County | |
| Merced County | |
| San Joaquin County | |
| Stanislaus County | |
| Tulare County | |
| Sutter County (part) (Sutter Buttes), CA (Marginal - Nonattainment) | |
| Sutter County (P) | |
| Ventura County (part), CA (Serious - Nonattainment) | |
| Ventura County (P) | |
| COLORADO (Region VIII) | |
| Denver-Boulder-Greeley-Ft. Collins-Loveland, CO (Marginal - Nonattainment) | |
| Adams County | |
| Arapahoe County | |
| Boulder County | |
| Broomfield County | |
| Denver County | |
| Douglas County | |
| Jefferson County | |
| Larimer County (P) | |
| Weld County (P) | |
| CONNECTICUT (Region I) | |
| Greater Connecticut, CT (Moderate - Nonattainment) | |
| Hartford County | |
| Litchfield County | |
| New London County | |
| Tolland County | |
| Windham County | |
| New York-N. New Jersey-Long Island, NY-NJ-CT (Moderate - Nonattainment) | |
| Fairfield County | |
| Middlesex County | |
| New Haven County | |
| DELAWARE (Region III) | |
| Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (Moderate - Nonattainment) | |
| Kent County | |
| New Castle County | |
| Sussex County | |
| DISTRICT OF COLUMBIA (Region III) | |
| Washington, DC-MD-VA (Moderate - Nonattainment) | |
| District of Columbia | |
| MARYLAND (Region III) | |
| Baltimore, MD (Serious - Nonattainment) | |
| Anne Arundel County | |
| Baltimore County | |
| Baltimore city | |
| Carroll County | |
| Harford County | |
| Howard County | |
| Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (Moderate - Nonattainment) | |
| Cecil County | |
| Washington, DC-MD-VA (Moderate - Nonattainment) | |
| Calvert County | |
| Charles County | |
| Frederick County | |
| Montgomery County | |
| Prince George's County | |
| MASSACHUSETTS (Region I) | |
| Boston-Lawrence-Worcester (E. Mass), MA (Moderate - Nonattainment) | |
| Barnstable County | |
| Bristol County | |
| Dukes County | |
| Essex County | |
| Middlesex County | |
| Nantucket County | |
| Norfolk County | |
| Plymouth County | |
| Suffolk County | |
| Worcester County | |
| Springfield (W. Mass), MA (Moderate - Nonattainment) | |
| Berkshire County | |
| Franklin County | |
| Hampden County | |
| Hampshire County | |
| NEW JERSEY (Region II) | |
| New York-N. New Jersey-Long Island, NY-NJ-CT (Moderate - Nonattainment) | |
| Bergen County | |
| Essex County | |
| Hudson County | |
| Hunterdon County | |
| Middlesex County | |
| Monmouth County | |
| Morris County | |
| Passaic County | |
| Somerset County | |
| Sussex County | |
| Union County | |
| Warren County | |
| Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (Moderate - Nonattainment) | |
| Atlantic County | |
| Burlington County | |
| Camden County | |
| Cape May County | |
| Cumberland County | |
| Gloucester County | |
| Mercer County | |
| Ocean County | |
| Salem County | |
| NEW YORK (Region II) | |
| Albany-Schenectady-Troy, NY (Marginal - Nonattainment) | |
| Albany County | |
| Greene County | |
| Montgomery County | |
| Rensselaer County | |
| Saratoga County | |
| Schenectady County | |
| Schoharie County | |
| Buffalo-Niagara Falls, NY (Moderate - Nonattainment) | |
| Erie County | |
| Niagara County | |
| Essex County (Whiteface Mtn.), NY (Marginal - Nonattainment) | |
| Essex County (P) | |
| Jamestown, NY (Moderate - Nonattainment) | |
| Chautauqua County | |
| Jefferson County, NY (Moderate - Nonattainment) | |
| Jefferson County | |
| New York-N. New Jersey-Long Island, NY-NJ-CT (Moderate - Nonattainment) | |
| Bronx County | |
| Kings County | |
| Nassau County | |
| New York County | |
| Queens County | |
| Richmond County | |
| Rockland County | |
| Suffolk County | |
| Westchester County | |
| Poughkeepsie, NY (Moderate - Nonattainment) | |
| Dutchess County | |
| Orange County | |
| Putnam County | |
| Rochester, NY (Marginal - Nonattainment) | |
| Genesee County | |
| Livingston County | |
| Monroe County | |
| Ontario County | |
| Orleans County | |
| Wayne County | |
| PENNSYLVANIA (Region III) | |
| Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE (Moderate - Nonattainment) | |
| Bucks County | |
| Chester County | |
| Delaware County | |
| Montgomery County | |
| Philadelphia County | |
| Pittsburgh-Beaver Valley, PA (Moderate - Nonattainment) | |
| Allegheny County | |
| Armstrong County | |
| Beaver County | |
| Butler County | |
| Fayette County | |
| Washington County | |
| Westmoreland County | |
| RHODE ISLAND (Region I) | |
| Providence (all of RI), RI (Moderate - Nonattainment) | |
| Bristol County | |
| Kent County | |
| Newport County | |
| Providence County | |
| Washington County | |
| TEXAS (Region VI) | |
| Dallas-Fort Worth, TX (Serious - Nonattainment) | |
| Collin County | |
| Dallas County | |
| Denton County | |
| Ellis County | |
| Johnson County | |
| Kaufman County | |
| Parker County | |
| Rockwall County | |
| Tarrant County | |
| Houston-Galveston-Brazoria, TX (Severe 15 - Nonattainment) | |
| Brazoria County | |
| Chambers County | |
| Fort Bend County | |
| Galveston County | |
| Harris County | |
| Liberty County | |
| Montgomery County | |
| Waller County | |
| VIRGINIA (Region III) | |
| Washington, DC-MD-VA (Moderate - Nonattainment) | |
| Alexandria city | |
| Arlington County | |
| Fairfax County | |
| Fairfax city | |
| Falls Church city | |
| Loudoun County | |
| Manassas Park city | |
| Manassas city | |
| Prince William County | |
| WISCONSIN (Region V) | |
| Inland Sheboygan County, WI (Moderate - Nonattainment) | |
| Sheboygan County (P) | |
| Shoreline Sheboygan County, WI (Moderate - Nonattainment) | |
| Sheboygan County (P) | |
Notes:
Details about the designations and classifications of previous 1-hour ozone nonattainment and maintenance areas can be found here.
On June 8, 2007, the United States Court of Appeals vacated the Subpart 1 portion of the Phase 1 Rule (Court Order) (PDF). On May 14, 2012, the Former Subpart 1 nonattainment areas were classified under Subpart 2 (77 FR 28424 ) (PDF), effective June 13, 2012.
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