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

40 C.F.R. § 52.1021

Classification of regions

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

Air quality control regionPollutant
Particulate matterSulfur oxidesNitrogen dioxideCarbon monoxideOzone
Metropolitan Portland IntrastateIIIIIIIIIIII
Androscoggin Valley InterstateIAIAIIIIIIIII
Down East IntrastateIAIAIIIIIIIII
Aroostook IntrastateIIIIIIIIIIIIIII
Northwest Maine IntrastateIIIIIIIIIIIIIII
[37 FR 10870, May 31, 1972, as amended at 45 FR 10774, Feb. 19, 1980]