GroundRules
40 CFR 52.1971: Classification of regions.
Where this section sits in the code
- Title 40—Protection of Environment
- CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
- SUBCHAPTER C—AIR PROGRAMS
- PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS
- Subpart MM—Oregon
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
Collected 2026-08-27T02:26:04Z. Source file · JSON