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

Data is current as of March 31, 2024

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 County and Waldo County, ME
Indianapolis, IN
Jersey County, IL
Kent County and Queen Anne's County, 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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