1-Hour Ozone (1979) Nonattainment Areas - NAAQS Revoked
Data is current as of January 31, 2025
| EXTREME |
| Los Angeles-South Coast Air Basin, CA |
| San Joaquin Valley, CA |
| |
| SEVERE |
| Chicago-Gary-Lake County, IL-IN |
| Houston-Galveston-Brazoria, TX |
| Milwaukee-Racine, WI |
| Morongo Band of Mission Indians, CA |
| New York-N. New Jersey-Long Island, NY-NJ-CT |
| Southeast Desert Modified AQMA, CA |
| Baltimore, MD |
| Baton Rouge, LA |
| Philadelphia-Wilmington-Trenton, PA-NJ-DE-MD |
| Sacramento Metro, CA |
| Ventura County, CA |
| Washington, DC-MD-VA |
| |
| SERIOUS |
| Beaumont-Port Arthur, TX |
| Boston-Lawrence-Worcester (E. Mass), MA-NH |
| Dallas-Fort Worth, TX |
| El Paso, TX |
| Greater Connecticut, CT |
| Portsmouth-Dover-Rochester, NH |
| Providence (all of RI), RI |
| Springfield (Western MA), MA |
| |
| MODERATE |
| Atlantic City, NJ |
| Knox County and Lincoln County, ME |
| Lewiston-Auburn, ME |
| Portland, ME |
| Poughkeepsie, NY |
| |
| MARGINAL |
| Albany-Schenectady-Troy, NY |
| Allentown-Bethlehem-Easton, PA-NJ |
| Altoona, PA |
| Buffalo-Niagara Falls, NY |
| Dona Ana County (part); Sunland Park, NM |
| Erie, PA |
| Harrisburg-Lebanon-Carlisle, PA |
| Jefferson County, NY |
| Johnstown, PA |
| Lancaster, PA |
| Manchester, NH |
| Reno, NV |
| Scranton-Wilkes-Barre, PA |
| Sussex County, DE |
| York, PA |
| Youngstown-Warren-Sharon, OH-PA (PA portion) |
| Essex County; Whiteface Mountain, NY |
| Smyth County; White Top Mountain, VA |
| |
| OTHER |
| San Francisco-Bay Area, CA |
| |
| SECTION 185A |
| Chico, CA |
| Imperial County, CA |
| Yuba City, CA |
| |
| INCOMPLETE DATA |
| Cheshire County, NH |
| Crawford County, PA |
| Franklin County, PA |
| Greene County, PA |
| Juniata County, PA |
| Lawrence County, PA |
| Northumberland County, PA |
| Pike County, PA |
| Salem, OR |
| Schuylkill County, PA |
| Snyder County, PA |
| Susquehanna County, PA |
| Warren County, PA |
| Wayne County, PA |
"Section 185A" was previously called "Transitional".
On July 10, 1998 (63 FR 37258), EPA published the final rule redesignating the San Francisco Bay Area to nonattainment with the federal 1-hour ozone NAAQS. EPA did not assign the Bay Area a classification. Then on July 22, 1999 (64 FR 39416) EPA published a final rule assigning the area a nonattainment classification on moderate for purposes of funding appropriation under the Transportation Equity Act for the 21st Century (TEA 21), Congestion Mitigation and Air Quality improvement Program (CMAQ) only.
The former 1-hour ozone designations and classifications as of June 15, 2004, are being retained in subpart C of Part 81 for purposes of the anti backsliding provisions of 40 CFR 51.905. 40 CFR 51.905(c) references subpart C of part 81 for the areas affected by the anti-backsliding regulation.
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