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8-Hour Ozone (2008) Maintenance Area (Redesignated from Nonattainment) Area/State/County Report
8-Hour Ozone (2008) Maintenance Area (Redesignated from Nonattainment) Area/State/County Report
Data is current as of November 30, 2025| Atlanta, GA (Moderate - Maintenance) | |
| GEORGIA (Region IV) | |
| Bartow County | |
| Cherokee County | |
| Clayton County | |
| Cobb County | |
| Coweta County | |
| DeKalb County | |
| Douglas County | |
| Fayette County | |
| Forsyth County | |
| Fulton County | |
| Gwinnett County | |
| Henry County | |
| Newton County | |
| Paulding County | |
| Rockdale County | |
| Baton Rouge, LA (Marginal - Maintenance) | |
| LOUISIANA (Region VI) | |
| Ascension Parish | |
| East Baton Rouge Parish | |
| Iberville Parish | |
| Livingston Parish | |
| West Baton Rouge Parish | |
| Charlotte-Rock Hill, NC-SC (Marginal - Maintenance) | |
| NORTH CAROLINA (Region IV) | |
| Cabarrus County (P) | |
| Gaston County (P) | |
| Iredell County (P) | |
| Lincoln County (P) | |
| Mecklenburg County | |
| Rowan County (P) | |
| Union County (P) | |
| SOUTH CAROLINA (Region IV) | |
| York County (P) | |
| Chicago-Naperville, IL-IN-WI (Serious - Maintenance) | |
| ILLINOIS (Region V) | |
| Cook County | |
| DuPage County | |
| Grundy County (P) | |
| Kane County | |
| Kendall County (P) | |
| Lake County | |
| McHenry County | |
| Will County | |
| INDIANA (Region V) | |
| Lake County | |
| Porter County | |
| WISCONSIN (Region V) | |
| Kenosha County (P) | |
| Cincinnati, OH-KY-IN (Marginal - Maintenance) | |
| INDIANA (Region V) | |
| Dearborn County (P) | |
Lawrenceburg Township | |
| KENTUCKY (Region IV) | |
| Boone County (P) | |
| Campbell County (P) | |
| Kenton County (P) | |
| OHIO (Region V) | |
| Butler County | |
| Clermont County | |
| Clinton County | |
| Hamilton County | |
| Warren County | |
| Cleveland-Akron-Lorain, OH (Marginal - Maintenance) | |
| OHIO (Region V) | |
| Ashtabula County | |
| Cuyahoga County | |
| Geauga County | |
| Lake County | |
| Lorain County | |
| Medina County | |
| Portage County | |
| Summit County | |
| Columbus, OH (Marginal - Maintenance) | |
| OHIO (Region V) | |
| Delaware County | |
| Fairfield County | |
| Franklin County | |
| Knox County | |
| Licking County | |
| Madison County | |
| Inland Sheboygan County, WI (Moderate - Maintenance) | |
| WISCONSIN (Region V) | |
| Sheboygan County (P) | |
| Knoxville, TN (Marginal - Maintenance) | |
| TENNESSEE (Region IV) | |
| Anderson County (P) | |
| Blount County | |
| Knox County | |
| Memphis, TN-MS-AR (Marginal - Maintenance) | |
| ARKANSAS (Region VI) | |
| Crittenden County | |
| MISSISSIPPI (Region IV) | |
| DeSoto County (P) | |
Portion along MPO Lines | |
| TENNESSEE (Region IV) | |
| Shelby County | |
| Shoreline Sheboygan County, WI (Moderate - Maintenance) | |
| WISCONSIN (Region V) | |
| Sheboygan County (P) | |
| St. Louis-St. Charles-Farmington, MO-IL (Marginal - Maintenance) | |
| ILLINOIS (Region V) | |
| Madison County | |
| Monroe County | |
| St. Clair County | |
| MISSOURI (Region VII) | |
| Franklin County | |
| Jefferson County | |
| St. Charles County | |
| St. Louis County | |
| St. Louis city | |
| Washington, DC-MD-VA (Marginal - Maintenance) | |
| DISTRICT OF COLUMBIA (Region III) | |
| District of Columbia | |
| MARYLAND (Region III) | |
| Calvert County | |
| Charles County | |
| Frederick County | |
| Montgomery County | |
| Prince George's County | |
| VIRGINIA (Region III) | |
| Alexandria city | |
| Arlington County | |
| Fairfax County | |
| Fairfax city | |
| Falls Church city | |
| Loudoun County | |
| Manassas Park city | |
| Manassas city | |
| Prince William County | |
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