40 C.F.R. § 52.1921

Current through May 31, 2024

Section 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 Intrastate	I	III	III	III	I
Northeastern Oklahoma Intrastate	I	III	III	III	I
Southeastern Oklahoma Intrastate	III	III	III	III	III
North Central Oklahoma Intrastate	III	III	III	III	III
Southwestern Oklahoma Intrastate	III	III	III	III	III
Northwestern Oklahoma Intrastate	III	III	III	III	III
Metropolitan Fort Smith Interstate	II	III	III	III	III
Shreveport-Texarkana-Tyler Interstate	II	III	III	III	III

40 C.F.R. §52.1921

37 FR 10887, May 31, 1972, as amended at 45 FR 9741, Feb. 13, 1980