40 C.F.R. § 52.1971

Classification of regions.

Last amended: 2016Year: 2026Length: 80 wordsOfficial source

Cite as 40 C.F.R. § 52.1971 (2026)

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]
40 C.F.R. § 52.1971: Classification of regions. | Justis AI