The Kentucky 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) | |
Appalachian Intrastate | II | III | III | III | III |
Bluegrass Intrastate | II | III | III | III | III |
Evansville (Indiana)-Owensboro-Henderson (Kentucky) Interstate | I | II | III | III | III |
Huntington (West Virginia)-Ashland (Kentucky)-Portsmouth-Ironton (Ohio) Interstate | I | III | III | III | III |
Louisville Interstate | I | I | III | III | I |
Metropolitan Cincinnati Interstate | I | II | III | III | I |
North Central Kentucky Intrastate | II | III | III | III | III |
Paducah (Kentucky)-Cairo (Illinois) Interstate | I | II | III | III | III |
South Central Kentucky Intrastate | III | III | III | III | III |
40 C.F.R. §52.921