40 CFR § 52.1421
Classification of regions
June 9, 2020
The Nebraska 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 | Photochemical oxidants (hydrocarbons) | |
Metropolitan Omaha-Council Bluffs Interstate | I | II | III | III | III |
Lincoln-Beatrice-Fairbury Intrastate | II | III | III | III | III |
Metropolitan Sioux City Interstate | III | III | III | III | III |
Nebraska Intrastate | III | III | III | III | III |
[37 FR 10877, May 31, 1972, as amended at 39 FR 16347, May 8, 1974]