40 C.F.R. § 52.1571
Classification of regions
The New Jersey 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) | |
| New Jersey-New York-Connecticut Interstate | I | I | I | I | I |
| Metropolitan Philadelphia Interstate | I | I | III | I | I |
| Northeast Pennsylvania-Upper Delaware Valley Interstate | I | II | III | III | III |
| New Jersey Intrastate | III | IA | III | I | III |