40 CFR 52.71 - Classification of regions.

Regulations most recently checked for updates: Aug 27, 2025

§ 52.71 - Classification of regions.

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

Air quality control Region	Pollutant
Air quality control Region	Particulate matter	Sulfur oxides	Nitrogen dioxide	Carbon monoxide	Ozone
Cook Inlet Intrastate	I	III	III	I	III.
Northern Alaska Intrastate	I	III	III	I	III.
South Central Alaska Intrastate	III	III	III	III	III.
Southeastern Alaska Intrastate	III	III	III	III	III.

[37 FR 10848, May 31, 1972, as amended at 48 FR 30625, July 5, 1983]