40 CFR 52.1321 - Classification of regions.

Regulations last checked for updates: Nov 24, 2024

Title 40 - Protection of Environment last revised: Nov 21, 2024

§ 52.1321 - Classification of regions.

The Missouri plans were 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	Photochemical oxidants (hydrocarbons)
Metropolitan Kansas City Interstate	I	III	III	I	I
Southwest Missouri Intrastate	I	III	III	III	III
Southeast Missouri Intrastate	III	III	III	III	III
Northern Missouri Intrastate	II	III	III	III	III
Metropolitan St. Louis Interstate	I	I	III	I	I

[37 FR 10875, May 31, 1972, as amended at 39 FR 16347, May 8, 1974]

authority: 42 U.S.C. 7401

cite as: 40 CFR 52.1321