40 CFR § 52.2321
Classification of regions
June 9, 2020
The Utah plan was 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) | |
| Wasatch Front Intrastate | I | I | I | I | I |
| Four Corners Interstate | IA | IA | III | III | III |
| Utah Intrastate | III | III | III | III | III |
[37 FR 10898, May 31, 1972, as amended at 39 FR 16347, May 8, 1974]
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