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 |