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 |