U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 40Chapter IPart 52Subpart MM - Subpart MM—Oregon
View all text of Subpart MM [§ 52.1970 - § 52.2019]
§ 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 InterstateIIAIIIII
Southwest Oregon IntrastateIIIIIIIIIIIIII
Northwest Oregon IntrastateIIIIIIIIIIIIIII
Central Oregon IntrastateIIIIIIIIIIIIII
Eastern Oregon IntrastateIIIIIIIIIIIIII
[37 FR 10888, May 31, 1972, as amended at 45 FR 42278, June 24, 1980]
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