The Missouri plans were 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 Kansas City Interstate | I | III | III | I | I
|
| Southwest Missouri Intrastate | I | III | III | III | III
|
| Southeast Missouri Intrastate | III | III | III | III | III
|
| Northern Missouri Intrastate | II | III | III | III | III
|
| Metropolitan St. Louis Interstate | I | I | III | I | I |