The Mississippi 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)----------------------------------------------------------------------------------------------------------------Mobile (Alabama)-Pensacola-Panama City (Florida)- I I III III I
Gulfport (Mississippi) Interstate...................Metropolitan Memphis Interstate...................... I III III III IMississippi Delta Intrastate......................... III III III III IIINortheast Mississippi Intrastate..................... II III III III III---------------------------------------------------------------------------------------------------------------- [37 FR 10875, May 31, 1972, as amended at 39 FR 16346, May 8, 1974]