40 CFR § 52.671
Classification of regions
June 9, 2020
The Idaho plan was evaluated on the basis of the following classifications:
Open Table
| Air quality control region | Pollutants | ||||
|---|---|---|---|---|---|
| Particulate matter | Sulfur oxides | Nitrogen dioxide | Carbon monoxide | Ozone | |
| Eastern Idaho Intrastate | I | II | III | III | III. |
| Eastern Washington Northern Idaho Interstate (Idaho) | I | II | III | III | III. |
| Idaho Intrastate | I | III | III | III | III. |
| Metropolitan Boise Intrastate | II | III | III | I | III. |
[37 FR 10861, May 31, 1972, as amended at 45 FR 70261, Oct. 23, 1980; 47 FR 32534, July 28, 1982]
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