40 CFR § 52.2171
Classification of regions
June 9, 2020
The South Dakota plan 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 Sioux City Interstate | III | III | III | III | III |
| Metropolitan Sioux Falls Interstate | II | III | III | III | III |
| Black Hills—Rapid City Intrastate | III | III | III | III | III |
| South Dakota Intrastate | III | III | III | III | III |
[37 FR 10893, May 31, 1972]
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