The Pennsylvania plan was evaluated on the basis of the following classifications:
Air quality control region | Pollutant | ||||
Particulate matter | Sulfur oxides | Nitrogen dioxide | Carbon monoxide | Ozone (hydrocarbons) | |
Metropolitan Philadelphia Interstate | I | I | III | I | I |
Northeast Pennsylvania-Upper Delaware Valley Interstate | I | II | III | III | III |
South Central Pennsylvania Intrastate | I | II | III | III | III |
Central Pennsylvania Intrastate | I | III | III | III | III |
Southwest Pennsylvania Intrastate | I | I | III | I | I |
Northwest Pennsylvania-Youngstown Interstate | I | II | III | III | III |
40 C.F.R. §52.2021