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

Data is current as of December 31, 2021
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The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015 (80 FR 12264).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
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 Co, MI
Detroit-Ann Arbor, MI
Kent and Queen Anne's Cos, MD
La Porte Co., 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 Co, MI
Allentown-Bethlehem-Easton, PA
Altoona, PA
Benton Harbor, MI
Benzie Co, MI
Birmingham, AL
Canton-Massillon, OH
Charleston, WV
Cincinnati-Hamilton, OH-KY-IN
Clarksville-Hopkinsville, TN-KY
Clearfield and Indiana Cos, PA
Columbus, OH
Dayton-Springfield, OH
Door Co, WI
Erie, PA
Evansville, IN
Flint, MI
Fort Wayne, IN
Franklin Co, PA
Grand Rapids, MI
Greene Co, IN
Greene Co, PA
Hancock, Knox, Lincoln and Waldo Cos, ME
Harrisburg-Lebanon-Carlisle, PA
Haywood and Swain Cos (Great Smoky NP), NC
Huntington-Ashland, WV-KY
Huron Co, MI
Indianapolis, IN
Jackson Co, IN
Johnstown, PA
Kalamazoo-Battle Creek, MI
Kewaunee Co, WI
Knoxville, TN
Lansing-East Lansing, MI
Lima, OH
Louisville, KY-IN
Macon, GA
Madison and Page Cos (Shenandoah NP), VA
Manitowoc Co, WI
Mason Co, MI
Muncie, IN
Murray Co (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 Co, 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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