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

40 C.F.R. § 52.671

Classification of regions

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

Air quality control regionPollutants
Particulate matterSulfur oxidesNitrogen dioxideCarbon monoxideOzone
Eastern Idaho IntrastateIIIIIIIIIIII.
Eastern Washington Northern Idaho Interstate (Idaho)IIIIIIIIIIII.
Idaho IntrastateIIIIIIIIIIIII.
Metropolitan Boise IntrastateIIIIIIIIIIII.
[37 FR 10861, May 31, 1972, as amended at 45 FR 70261, Oct. 23, 1980; 47 FR 32534, July 28, 1982]