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1-Hour Ozone (1979) Maintenance Area (Redesignated from Nonattainment) State/Area/County Report - NAAQS Revoked
1-Hour Ozone (1979) Maintenance Area (Redesignated from Nonattainment) State/Area/County Report - NAAQS Revoked
Data is current as of March 31, 2024| ALABAMA (Region IV) | |
| Birmingham, AL (Marginal - Maintenance) | |
| Jefferson County | |
| Shelby County | |
| ARIZONA (Region IX) | |
| Phoenix, AZ (Serious - Maintenance) | |
| Maricopa County (P) | |
| Maricopa Association of Governments Urban Planning Area | |
| CALIFORNIA (Region IX) | |
| East Kern County, CA (Serious - Maintenance) | |
| Kern County (P) | |
| Monterey Bay, CA (Moderate - Maintenance) | |
| Monterey County | |
| San Benito County | |
| Santa Cruz County | |
| San Diego, CA (Serious - Maintenance) | |
| San Diego County | |
| Santa Barbara-Santa Maria-Lompoc, CA (Serious - Maintenance) | |
| Santa Barbara County | |
| COLORADO (Region VIII) | |
| Denver-Boulder, CO (Section 185A - Maintenance) | |
| Adams County (P) | |
| West of Kiowa Creek | |
| Arapahoe County (P) | |
| West of Kiowa Creek | |
| Boulder County (P) | |
| Excluding Rocky Mtn. National Park | |
| Broomfield County | |
| Denver County | |
| Douglas County | |
| Jefferson County | |
| FLORIDA (Region IV) | |
| Jacksonville, FL (Section 185A - Maintenance) | |
| Duval County | |
| Miami-Fort Lauderdale-W. Palm Beach, FL (Moderate - Maintenance) | |
| Broward County | |
| Miami-Dade County | |
| Palm Beach County | |
| Tampa-St. Petersburg-Clearwater, FL (Marginal - Maintenance) | |
| Hillsborough County | |
| Pinellas County | |
| GEORGIA (Region IV) | |
| Atlanta, GA (Severe-15 - Maintenance) | |
| Cherokee County | |
| Clayton County | |
| Cobb County | |
| Coweta County | |
| DeKalb County | |
| Douglas County | |
| Fayette County | |
| Forsyth County | |
| Fulton County | |
| Gwinnett County | |
| Henry County | |
| Paulding County | |
| Rockdale County | |
| ILLINOIS (Region V) | |
| Jersey County, IL (Marginal - Maintenance) | |
| Jersey County | |
| St. Louis, MO-IL (Serious - Maintenance) | |
| Madison County | |
| Monroe County | |
| St. Clair County | |
| INDIANA (Region V) | |
| Evansville, IN (Marginal - Maintenance) | |
| Vanderburgh County | |
| Indianapolis, IN (Marginal - Maintenance) | |
| Marion County | |
| Louisville, KY-IN (Moderate - Maintenance) | |
| Clark County | |
| Floyd County | |
| South Bend-Elkhart, IN (Marginal - Maintenance) | |
| Elkhart County | |
| St. Joseph County | |
| KANSAS (Region VII) | |
| Kansas City, MO-KS (Other - Maintenance) | |
| Johnson County | |
| Wyandotte County | |
| KENTUCKY (Region IV) | |
| Cincinnati-Hamilton, OH-KY (Moderate - Maintenance) | |
| Boone County | |
| Campbell County | |
| Kenton County | |
| Edmonson County, KY (Rural Transport (Marginal) - Maintenance) | |
| Edmonson County | |
| Huntington-Ashland, WV-KY (Moderate - Maintenance) | |
| Boyd County | |
| Greenup County (P) | |
| Lexington-Fayette, KY (Marginal - Maintenance) | |
| Fayette County | |
| Scott County | |
| Louisville, KY-IN (Moderate - Maintenance) | |
| Bullitt County (P) | |
| Jefferson County | |
| Oldham County (P) | |
| Owensboro, KY (Marginal - Maintenance) | |
| Daviess County | |
| Hancock County (P) | |
| Paducah, KY (Marginal - Maintenance) | |
| Livingston County (P) | |
| Marshall County | |
| LOUISIANA (Region VI) | |
| Beauregard Parish, LA (Incomplete Data - Maintenance) | |
| Beauregard Parish | |
| Grant Parish, LA (Incomplete Data - Maintenance) | |
| Grant Parish | |
| Lafayette, LA (Section 185A - Maintenance) | |
| Lafayette Parish | |
| Lafourche Parish, LA (Incomplete Data - Maintenance) | |
| Lafourche Parish | |
| Lake Charles, LA (Marginal - Maintenance) | |
| Calcasieu Parish | |
| New Orleans, LA (Section 185A - Maintenance) | |
| Jefferson Parish | |
| Orleans Parish | |
| St. Bernard Parish | |
| St. Charles Parish | |
| Pointe Coupee Parish, LA (Marginal - Maintenance) | |
| Pointe Coupee Parish | |
| St. James Parish, LA (Incomplete Data - Maintenance) | |
| St. James Parish | |
| St. Mary Parish, LA (Incomplete Data - Maintenance) | |
| St. Mary Parish | |
| MAINE (Region I) | |
| Hancock County and Waldo County, ME (Marginal - Maintenance) | |
| Hancock County | |
| Waldo County | |
| MARYLAND (Region III) | |
| Kent County and Queen Anne's County, MD (Marginal - Maintenance) | |
| Kent County | |
| Queen Anne's County | |
| MICHIGAN (Region V) | |
| Allegan County, MI (Incomplete Data - Maintenance) | |
| Allegan County | |
| Detroit-Ann Arbor, MI (Moderate - Maintenance) | |
| Livingston County | |
| Macomb County | |
| Monroe County | |
| Oakland County | |
| St. Clair County | |
| Washtenaw County | |
| Wayne County | |
| Flint, MI (Section 185A - Maintenance) | |
| Genesee County | |
| Grand Rapids, MI (Moderate - Maintenance) | |
| Kent County | |
| Ottawa County | |
| Muskegon, MI (Moderate - Maintenance) | |
| Muskegon County | |
| Saginaw-Bay City-Midland, MI (Incomplete Data - Maintenance) | |
| Bay County | |
| Midland County | |
| Saginaw County | |
| MISSOURI (Region VII) | |
| Kansas City, MO-KS (Other - Maintenance) | |
| Clay County | |
| Jackson County | |
| Platte County | |
| St. Louis, MO-IL (Serious - Maintenance) | |
| Franklin County | |
| Jefferson County | |
| St. Charles County | |
| St. Louis County | |
| St. Louis city | |
| NORTH CAROLINA (Region IV) | |
| Charlotte-Gastonia, NC (Moderate - Maintenance) | |
| Gaston County | |
| Mecklenburg County | |
| Greensboro-Winston-Salem-High Point, NC (Moderate - Maintenance) | |
| Davidson County | |
| Davie County (P) | |
| Forsyth County | |
| Guilford County | |
| Raleigh-Durham, NC (Moderate - Maintenance) | |
| Durham County | |
| Granville County (P) | |
| Dutchville Township | |
| Wake County | |
| OHIO (Region V) | |
| Canton, OH (Marginal - Maintenance) | |
| Stark County | |
| Cincinnati-Hamilton, OH-KY (Moderate - Maintenance) | |
| Butler County | |
| Clermont County | |
| Hamilton County | |
| Warren County | |
| Cleveland-Akron-Lorain, OH (Moderate - Maintenance) | |
| Ashtabula County | |
| Cuyahoga County | |
| Geauga County | |
| Lake County | |
| Lorain County | |
| Medina County | |
| Portage County | |
| Summit County | |
| Clinton County, OH (Section 185A - Maintenance) | |
| Clinton County | |
| Columbiana County, OH (Incomplete Data - Maintenance) | |
| Columbiana County | |
| Columbus, OH (Marginal - Maintenance) | |
| Delaware County | |
| Franklin County | |
| Licking County | |
| Dayton-Springfield, OH (Moderate - Maintenance) | |
| Clark County | |
| Greene County | |
| Miami County | |
| Montgomery County | |
| Preble County, OH (Section 185A - Maintenance) | |
| Preble County | |
| Steubenville, OH (Section 185A - Maintenance) | |
| Jefferson County | |
| Toledo, OH (Moderate - Maintenance) | |
| Lucas County | |
| Wood County | |
| Youngstown-Warren-Sharon, OH-PA (OH portion) (Marginal - Maintenance) | |
| Mahoning County | |
| Trumbull County | |
| OREGON (Region X) | |
| Portland-Vancouver AQMA, OR-WA (Marginal - Maintenance) | |
| Clackamas County (P) | |
| Air Quality Maintenance Area | |
| Multnomah County (P) | |
| Air Quality Maintenance Area | |
| Washington County (P) | |
| Air Quality Maintenance Area | |
| PENNSYLVANIA (Region III) | |
| Pittsburgh-Beaver Valley, PA (Moderate - Maintenance) | |
| Allegheny County | |
| Armstrong County | |
| Beaver County | |
| Butler County | |
| Fayette County | |
| Washington County | |
| Westmoreland County | |
| Reading, PA (Moderate - Maintenance) | |
| Berks County | |
| SOUTH CAROLINA (Region IV) | |
| Cherokee County, SC (Marginal - Maintenance) | |
| Cherokee County | |
| TENNESSEE (Region IV) | |
| Knoxville, TN (Marginal - Maintenance) | |
| Knox County | |
| Memphis, TN (Marginal - Maintenance) | |
| Shelby County | |
| Nashville, TN (Moderate - Maintenance) | |
| Davidson County | |
| Rutherford County | |
| Sumner County | |
| Williamson County | |
| Wilson County | |
| TEXAS (Region VI) | |
| Victoria, TX (Incomplete Data - Maintenance) | |
| Victoria County | |
| UTAH (Region VIII) | |
| Salt Lake City, UT (Moderate - Maintenance) | |
| Davis County | |
| Salt Lake County | |
| VIRGINIA (Region III) | |
| Norfolk-Virginia Beach-Newport News (Hampton Roads), VA (Marginal - Maintenance) | |
| Chesapeake city | |
| Hampton city | |
| James City County | |
| Newport News city | |
| Norfolk city | |
| Poquoson city | |
| Portsmouth city | |
| Suffolk city | |
| Virginia Beach city | |
| Williamsburg city | |
| York County | |
| Richmond, VA (Moderate - Maintenance) | |
| Charles City County (P) | |
| Chesterfield County | |
| Colonial Heights city | |
| Hanover County | |
| Henrico County | |
| Hopewell city | |
| Richmond city | |
| WASHINGTON (Region X) | |
| Portland-Vancouver AQMA, OR-WA (Marginal - Maintenance) | |
| Clark County (P) | |
| Air Quality Maintenance Area | |
| Seattle-Tacoma, WA (Marginal - Maintenance) | |
| King County (P) | |
| Pierce County | |
| Snohomish County (P) | |
| WEST VIRGINIA (Region III) | |
| Charleston, WV (Moderate - Maintenance) | |
| Kanawha County | |
| Putnam County | |
| Greenbrier, WV (Marginal - Maintenance) | |
| Greenbrier County | |
| Huntington-Ashland, WV-KY (Moderate - Maintenance) | |
| Cabell County | |
| Wayne County | |
| Parkersburg-Marietta, WV (Moderate - Maintenance) | |
| Wood County | |
| WISCONSIN (Region V) | |
| Door County, WI (Rural Transport (Marginal) - Maintenance) | |
| Door County | |
| Kewaunee County, WI (Moderate - Maintenance) | |
| Kewaunee County | |
| Manitowoc County, WI (Moderate - Maintenance) | |
| Manitowoc County | |
| Sheboygan, WI (Moderate - Maintenance) | |
| Sheboygan County | |
| Walworth County, WI (Marginal - Maintenance) | |
| Walworth County | |
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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