40 CFR 52.171 - Classification of regions.

The Arkansas 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 Arkansas Intrastate	II	III	III	III	III	Metropolitan Fort Smith Interstate	II	III	III	III	III	Metropolitan Memphis Interstate	I	III	III	III	I	Monroe (Louisiana)-El Dorado (Arkansas) Interstate	II	III	III	III	III	Northeast Arkansas Intrastate	III	III	III	III	III	Northwest Arkansas Intrastate	III	III	III	III	III	Shreveport-Texarkana-Tyler Interstate	II	III	III	III	III

[37 FR 10850, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 6571, Jan. 29, 1980]