The Missouri plans were 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 Kansas City Interstate.................. I III III I ISouthwest Missouri Intrastate........................ I III III III IIISoutheast Missouri Intrastate........................ III III III III IIINorthern Missouri Intrastate......................... II III III III IIIMetropolitan St. Louis Interstate.................... I I III I I---------------------------------------------------------------------------------------------------------------- [37 FR 10875, May 31, 1972, as amended at 39 FR 16347, May 8, 1974]