40 CFR § 52.2021
Classification of regions
June 9, 2020
The Pennsylvania plan was evaluated on the basis of the following classifications:
Open Table
| 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 |
[37 FR 10889, May 31, 1972, as amended at 39 FR 16347, May 8, 1974; 45 FR 33627, May 20, 1980]
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