The South Dakota plan 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 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 |