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

40 C.F.R. § 52.1921

Classification of regions

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

Air quality control regionPollutant
Particulate matterSulfur oxidesNitrogen dioxideCarbon monoxideOzone
Central Oklahoma IntrastateIIIIIIIIIII
Northeastern Oklahoma IntrastateIIIIIIIIIII
Southeastern Oklahoma IntrastateIIIIIIIIIIIIIII
North Central Oklahoma IntrastateIIIIIIIIIIIIIII
Southwestern Oklahoma IntrastateIIIIIIIIIIIIIII
Northwestern Oklahoma IntrastateIIIIIIIIIIIIIII
Metropolitan Fort Smith InterstateIIIIIIIIIIIIII
Shreveport-Texarkana-Tyler InterstateIIIIIIIIIIIIII
[37 FR 10887, May 31, 1972, as amended at 45 FR 9741, Feb. 13, 1980]