40 CFR 52.2521: Classification of regions.

The West Virginia plan was evaluated on the basis of the following classifications:

Air quality control region Pollutant

Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical oxidants (hydrocarbons)

Steubenville-Weirton-Wheeling Interstate I I III III III

Parkersburg-Marietta Interstate I II III III III

Huntington-Ashland-Portsmouth-Ironton Interstate I III III III III

Kanawha Valley Intrastate I III III III III

Southern West Virginia Intrastate III III III III III

North Central West Virginia Intrastate I III III III III

Cumberland-Keyser Interstate I I III III III

Central West Virginia Intrastate III III III III III

Allegheny Intrastate III III III III III

Eastern Panhandle Intrastate III III III III III