The Arkansas plan was evaluated on the basis of the following classifications:
| Air quality control region
| Pollutant
|
|---|
| Particulate matter
| Sulfur oxides
| Nitrogen dioxide
| Carbon monoxide
| Ozone
|
|---|
| Central Arkansas Intrastate | II | III | III | III | III
|
| Metropolitan Fort Smith Interstate | II | III | III | III | III
|
| Metropolitan Memphis Interstate | I | III | III | III | I
|
| Monroe (Louisiana)-El Dorado (Arkansas) Interstate | II | III | III | III | III
|
| Northeast Arkansas Intrastate | III | III | III | III | III
|
| Northwest Arkansas Intrastate | III | III | III | III | III
|
| Shreveport-Texarkana-Tyler Interstate | II | III | III | III | III |