8-Hour Ozone (2015) Maintenance Area (Redesignated from Nonattainment) State/Area/County Report

Data is current as of November 30, 2025

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GEORGIA (Region IV)

Atlanta, GA (Marginal - Maintenance)

Bartow County

Clayton County

Cobb County

DeKalb County

Fulton County

Gwinnett County

Henry County

INDIANA (Region V)

Louisville, KY-IN (Marginal - Maintenance)

Clark County

Floyd County

KENTUCKY (Region IV)

Cincinnati, OH-KY (Moderate - Maintenance)

Boone County (P)

Campbell County (P)

Kenton County (P)

MICHIGAN (Region V)

Detroit, MI (Moderate - Maintenance)

Livingston County

Macomb County

Monroe County

Oakland County

St. Clair County

Washtenaw County

Wayne County

OHIO (Region V)

Cincinnati, OH-KY (Marginal - Maintenance)

Butler County

Clermont County

Hamilton County

Warren County

Columbus, OH (Marginal - Maintenance)

Delaware County

Fairfield County

Franklin County

Licking County

WISCONSIN (Region V)

Door County, WI (Marginal (Rural Transport) - Maintenance)

Door County (P)

Newport State Park Boundary

Door County-Revised, WI (Marginal (Rural Transport) - Maintenance)

Door County (P)

The portion of Door County north of Sturgeon Bay Canal excluding Newport State Park

Manitowoc County, WI (Marginal - Maintenance)

Manitowoc County (P)

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