40 CFR 52.1871: Classification of regions.

The Ohio plan was evaluated on the basis of the following classifications:

Air quality control region Pollutant

Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone

Greater Metropolitan Cleveland Intrastate I I III III I

Huntington (West Virginia)-Ashland (Kentucky)-Portsmouth-Ironton (Ohio) Interstate I III III III III

Mansfield-Marion Intrastate II II III III III

Metropolitan Cincinnati Interstate I II III III I

Metropolitan Columbus Intrastate I III III III I

Metropolitan Dayton Intrastate I II III III I

Metropolitan Toledo Interstate I I III III I

Northwest Ohio Intrastate II I III III III

Northwest Pennsylvania-Youngstown Interstate I II III III III

Parkersburg (West Virginia)-Marietta (Ohio) Interstate I II III III III

Sandusky Intrastate III III III III III

Steubenville-Weirton-Wheeling Interstate I I III III III

Wilmington-Chillicothe-Logan Intrastate III III III III III

Zanesville-Cambridge Intrastate II IA III III III