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40 C.F.R. § 52.1921

Classification of regions.

§ 52.1921 Classification of regions.

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

Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone
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
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