Classification of regions.

The South Carolina 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 I III III III Metropolitan Charlotte Interstate I II III III I Camden-Sumter Intrastate II III III III III Charleston Intrastate I I III III III Columbia Intrastate II III III III III Florence Intrastate III III III III III Georgetown Intrastate II III III III III Greenville-Spartanburg Intrastate I III III III III Greenwood Intrastate III III III III III Savannah (Georgia)-Beaufort (South Carolina) Interstate I I III III III