The Maryland plans were evaluated on the basis of the following classifications:
Air quality control region | Pollutant | ||||
Particulate matter | Sulfur oxides | Nitrogen dioxide | Carbon monoxide | Ozone | |
Cumberland-Keyser Interstate | I | I | III | III | III |
Central Maryland Intrastate | II | II | III | III | III |
Metropolitan Baltimore Intrastate | I | I | I | I | I |
National Capital Interstate | I | I | III | I | I |
Southern Maryland Intrastate | III | III | III | III | III |
Eastern Shore Intrastate | II | III | III | III | III |
40 C.F.R. §52.1071