The Utah plan was evaluated on the basis of the following classifications:
| 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 |