40 CFR § 52.1971
Classification of regions
June 9, 2020
The Oregon 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 | |
| Portland Interstate | I | IA | III | I | I |
| Southwest Oregon Intrastate | II | III | III | III | III |
| Northwest Oregon Intrastate | III | III | III | III | III |
| Central Oregon Intrastate | II | III | III | III | III |
| Eastern Oregon Intrastate | II | III | III | III | III |
[37 FR 10888, May 31, 1972, as amended at 45 FR 42278, June 24, 1980]
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