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1-Hour Ozone (1979) Nonattainment Areas - NAAQS Revoked

Data is current as of December 31, 2021

Los Angeles-South Coast Air Basin, CA
San Joaquin Valley, CA
Chicago-Gary-Lake County, IL-IN
Houston-Galveston-Brazoria, TX
Milwaukee-Racine, WI
Morongo Band of Mission Indians
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 Co, CA
Washington, DC-MD-VA
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
Atlantic City, NJ
Knox & Lincoln Co.s, ME
Lewiston-Auburn, ME
Portland, ME
Poughkeepsie, NY
Albany-Schenectady-Troy, NY
Allentown-Bethlehem-Easton, PA-NJ
Altoona, PA
Buffalo-Niagara Falls, NY
Erie, PA
Harrisburg-Lebanon-Carlisle, PA
Jefferson Co, NY
Johnstown, PA
Lancaster, PA
Manchester, NH
Reno, NV
Scranton-Wilkes-Barre, PA
Sunland Park, NM (New Area 1995)
Sussex Co, DE
York, PA
Youngstown-Warren-Sharon, OH-PA (PA portion)
Essex Co, NY
Smyth Co, VA (White Top Mtn)
San Francisco Bay Area, CA
Chico, CA
Imperial Co, CA
Yuba City, CA
Cheshire Co, NH
Crawford Co, PA
Franklin Co, PA
Greene Co, PA
Juniata Co, PA
Lawrence Co, PA
Northumberland Co, PA
Pike Co, PA
Salem, OR
Schuylkill Co, PA
Snyder Co, PA
Susquehanna Co, PA
Warren Co, PA
Wayne Co, 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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