40 CFR § 52.1021
Classification of regions
June 9, 2020
The Maine 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 | |
Metropolitan Portland Intrastate | I | II | III | III | III |
Androscoggin Valley Interstate | IA | IA | III | III | III |
Down East Intrastate | IA | IA | III | III | III |
Aroostook Intrastate | III | III | III | III | III |
Northwest Maine Intrastate | III | III | III | III | III |
[37 FR 10870, May 31, 1972, as amended at 45 FR 10774, Feb. 19, 1980]