40 CFR 52.1321 - Classification of regions.

The Missouri plans were evaluated on the basis of the following classifications:

Air quality control region	Pollutant					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]