The Nebraska plan was evaluated on the basis of the following classifications: ----------------------------------------------------------------------------------------------------------------
Pollutant
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Air quality control region Photochemical
Particulate Sulfur Nitrogen Carbon oxidants
matter oxides dioxide monoxide (hydrocarbons)----------------------------------------------------------------------------------------------------------------Metropolitan Omaha-Council Bluffs Interstate......... I II III III IIILincoln-Beatrice-Fairbury Intrastate................. II III III III IIIMetropolitan Sioux City Interstate................... III III III III IIINebraska Intrastate.................................. III III III III III---------------------------------------------------------------------------------------------------------------- [37 FR 10877, May 31, 1972, as amended at 39 FR 16347, May 8, 1974]