40 CFR § 52.171
Classification of regions
June 9, 2020
The Arkansas plan was evaluated on the basis of the following classifications:
Open Table
| 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 |
[37 FR 10850, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 6571, Jan. 29, 1980]
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