View all text of Subpart NN [§ 52.2020 - § 52.2065]
§ 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 |
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