Classification of regions.

The Georgia plan was evaluated on the basis of the following classifications: Air quality control region Pollutant Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Photochemical oxidants (hydrocarbons) Augusta (Georgia)-Aiken (South Carolina) Interstate I II III III III Metropolitan Atlanta Intrastate I I III III III Chattanooga Interstate I II III III III Columbus (Georgia)-Phenix City (Alabama) Interstate I III III III III Central Georgia Intrastate I I III III III Jacksonville (Florida)-Brunswick (Georgia) Interstate I II III III I Northeast Georgia Intrastate II III III III III Savannah (Georgia)-Beaufort (South Carolina) Interstate I I III III III Southwest Georgia Intrastate II II III III III [37 FR 10859, May 31, 1972, as amended at 39 FR 16346, May 8, 1974]