Classification of regions.

  1. Law
  2. CFR 40
  3. Protection of Environment
  4. Environmental Protection Agency
  5. Air Programs
  6. Approval and Promulgation of Implementation Plans
  7. Oregon
  8. Classification of regions.

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§ 52.1971 Classification of regions.

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

Expand 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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