40 CFR § 52.1321
Classification of regions
June 9, 2020
The Missouri plans were evaluated on the basis of the following classifications:
Open Table
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]