Title 40

SECTION 52.1971

52.1971 Classification of regions.

§ 52.1971 Classification of regions.

The Oregon plan was evaluated on the basis of the following classifications:

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]