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8-Hour Ozone (1997) Maintenance Areas (Redesignated from Nonattainment) - NAAQS Revoked

Data is current as of February 29, 2024
View Notes
The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).

SEVERE 17 (June 2021)
Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, CA
MODERATE (June 2010)
Atlanta, GA
Baton Rouge, LA
Beaumont-Port Arthur, TX
Boston-Manchester-Portsmouth (SE), NH
Charlotte-Gastonia-Rock Hill, NC-SC
Chicago-Gary-Lake County, IL-IN
Cleveland-Akron-Lorain, OH
Fredericksburg, VA
Memphis, TN-AR
Milwaukee-Racine, WI
San Diego, CA
St. Louis, MO-IL
MARGINAL (June 2007)
Cass County, MI
Detroit-Ann Arbor, MI
Kent and Queen Anne's Counties, MD
La Porte County, IN
Lancaster, PA
Las Vegas, NV
Muskegon, MI
Norfolk-Virginia Beach-Newport News (Hampton Roads), VA
Phoenix-Mesa, AZ
Portland, ME
Richmond-Petersburg, VA
Allegan County, MI
Allentown-Bethlehem-Easton, PA
Altoona, PA
Benton Harbor, MI
Benzie County, MI
Birmingham, AL
Canton-Massillon, OH
Charleston, WV
Cincinnati-Hamilton, OH-KY-IN
Clarksville-Hopkinsville, TN-KY
Clearfield and Indiana Counties, PA
Columbus, OH
Dayton-Springfield, OH
Door County, WI
Erie, PA
Evansville, IN
Flint, MI
Fort Wayne, IN
Franklin County, PA
Grand Rapids, MI
Greene County, IN
Greene County, PA
Hancock, Knox, Lincoln and Waldo Counties (Central Maine Coast), ME
Harrisburg-Lebanon-Carlisle, PA
Haywood and Swain Counties (Great Smoky NP), NC
Huntington-Ashland, WV-KY
Huron County, MI
Indianapolis, IN
Jackson County, IN
Johnstown, PA
Kalamazoo-Battle Creek, MI
Kewaunee County, WI
Knoxville, TN
Lansing-East Lansing, MI
Lima, OH
Louisville, KY-IN
Macon, GA
Madison and Page Counties (Shenandoah NP), VA
Manitowoc County, WI
Mason County, MI
Muncie, IN
Murray County (Chattahoochee Nat Forest), GA
Parkersburg-Marietta, WV-OH
Raleigh-Durham-Chapel Hill, NC
Reading, PA
Rocky Mount, NC
Scranton-Wilkes-Barre, PA
South Bend-Elkhart, IN
State College, PA
Steubenville-Weirton, OH-WV
Terre Haute, IN
Tioga County, PA
Toledo, OH
Wheeling, WV-OH
York, PA
Youngstown-Warren-Sharon, OH-PA


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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