The Tennessee 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)
|
|---|
| Eastern Tennessee-Southwestern Virginia Interstate | I | I | III | III | III
|
| Tennessee River Valley-Cumberland Mountains Intrastate | I | I | III | III | III
|
| Middle Tennessee Intrastate | I | II | III | III | I
|
| Western Tennessee Intrastate | I | III | III | III | III
|
| Chattanooga Interstate | I | II | III | III | III
|
| Metropolitan Memphis Interstate | I | III | III | III | I |