8-Hour Ozone (1997) Maintenance Areas (Redesignated from Nonattainment) - NAAQS Revoked
Data is current as of November 30, 2025
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The 1997 8-hour Ozone NAAQS was revoked effective April 6, 2015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 |
| |
| FORMER SUBPART 1 |
| 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 |
Notes:
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.
Go Top
