40 CFR 52.2321 - Classification of regions.

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

Air quality control region	Pollutant					Particulate matter	Sulfur oxides	Nitrogen dioxide	Carbon monoxide	Photochemical oxidants (hydrocarbons)	Wasatch Front Intrastate	I	I	I	I	I	Four Corners Interstate	IA	IA	III	III	III	Utah Intrastate	III	III	III	III	III

[37 FR 10898, May 31, 1972, as amended at 39 FR 16347, May 8, 1974]