The Tennessee 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)----------------------------------------------------------------------------------------------------------------Eastern Tennessee-Southwestern Virginia Interstate... I I III III IIITennessee River Valley-Cumberland Mountains I I III III III
Intrastate..........................................Middle Tennessee Intrastate.......................... I II III III IWestern Tennessee Intrastate......................... I III III III IIIChattanooga Interstate............................... I II III III IIIMetropolitan Memphis Interstate...................... I III III III I---------------------------------------------------------------------------------------------------------------- [37 FR 10894, May 31, 1972, as amended at 39 FR 16347, May 8, 1974]