40 CFR § 52.821
Classification of regions
June 9, 2020
The Iowa plan was evaluated on the basis of the following classification:
Open Table
| Air quality control region | Pollutant | ||||
|---|---|---|---|---|---|
| Particulate matter | Sulfur oxides | Nitrogen dioxide | Carbon monoxide | Photochemical oxidants (hydrocarbons) | |
| Metropolitan Omaha-Council Bluffs Interstate | I | II | III | III | III |
| Metropolitan Sioux Falls Interstate | II | III | III | III | III |
| Metropolitan Sioux City Interstate | III | III | III | III | III |
| Metropolitan Dubuque Interstate | I | III | III | III | III |
| Metropolitan Quad Cities Interstate | I | III | III | III | III |
| Burlington-Keokuk Interstate | I | I | III | III | III |
| Northwest Iowa Intrastate | III | III | III | III | III |
| North Central Iowa Intrastate | IA | III | III | III | III |
| Northeast Iowa Intrastate | I | III | III | III | III |
| Southwest Iowa Intrastate | III | III | III | III | III |
| South Central Iowa Intrastate | I | III | III | III | I |
| Southeast Iowa Intrastate | III | III | III | III | III |
[37 FR 10865, May 31, 1972, as amended at 39 FR 16346, May 8, 1974]
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