Daily eCFR

§ 52.71 Classification of regions.

40 CFR 52.71

Citation40 CFR 52.71

CorpusDaily eCFR

Displayed edition2026-08-31

Last updated2026-08-31

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

Air quality control Region	Pollutant
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]