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]


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