40 CFR 52.71 - Classification of regions.

Regulations last checked for updates: Feb 10, 2026

Title 40 - Protection of Environment last revised: Dec 22, 2026

§ 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]

authority: 42 U.S.C. 7401

cite as: 40 CFR 52.71