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§ 52.2021 Classification of regions.
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 |