C.F.R. » Title 40 » CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY › SUBCHAPTER C—AIR PROGRAMS › PART 52—APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS › Subpart MM—Oregon

40 C.F.R. § 52.1971

Classification of regions

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

Air quality control regionPollutant
Particulate matterSulfur oxidesNitrogen dioxideCarbon monoxideOzone
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]