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1-Hour Ozone (1979) Maintenance Areas (Redesignated from Nonattainment) - NAAQS Revoked

Data is current as of June 30, 2022

Atlanta, GA
East Kern County, CA
Phoenix, AZ
San Diego, CA
Santa Barbara-Santa Maria-Lompoc, CA
St. Louis, MO-IL
Charleston, WV
Charlotte-Gastonia, NC
Cincinnati-Hamilton, OH-KY
Cleveland-Akron-Lorain, OH
Dayton-Springfield, OH
Detroit-Ann Arbor, MI
Grand Rapids, MI
Greensboro-Winston-Salem-High Point, NC
Huntington-Ashland, WV-KY
Kewaunee County, WI
Louisville, KY-IN
Manitowoc County, WI
Miami-Fort Lauderdale-W. Palm Beach, FL
Monterey Bay, CA
Muskegon, MI
Nashville, TN
Parkersburg-Marietta, WV
Pittsburgh-Beaver Valley, PA
Raleigh-Durham, NC
Reading, PA
Richmond, VA
Salt Lake City, UT
Sheboygan, WI
Toledo, OH
Birmingham, AL
Canton, OH
Cherokee County, SC
Columbus, OH
Evansville, IN
Greenbrier, WV
Hancock & Waldo Counties, ME
Indianapolis, IN
Jersey County, IL
Kent and Queen Anne's Co.s, MD
Knoxville, TN
Lake Charles, LA
Lexington-Fayette, KY
Memphis, TN
Norfolk-Virginia Beach-Newport News (Hampton Roads), VA
Owensboro, KY
Paducah, KY
Pointe Coupee Parish, LA
Portland-Vancouver AQMA, OR-WA
Seattle-Tacoma, WA
South Bend-Elkhart, IN
Tampa-St. Petersburg-Clearwater, FL
Walworth County, WI
Youngstown-Warren-Sharon, OH-PA (OH portion)
Door County, WI
Edmonson County, KY
Kansas City, MO-KS
Clinton County, OH
Denver-Boulder, CO
Flint, MI
Jacksonville, FL
Lafayette, LA
New Orleans, LA
Preble County, OH
Steubenville, OH
Allegan County, MI
Beauregard Parish, LA
Columbiana County, OH
Grant Parish, LA
Lafourche Parish, LA
Saginaw-Bay City-Midland, MI
St James Parish, LA
St Mary Parish, LA
Victoria, TX

These areas are designated attainment . The Kansas City, MO-KS area has a sub-marginal classification. 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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