The North Dakota 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) | |
Metropolitan Fargo-Moorhead Interstate | II | III | III | III | III |
North Dakota Intrastate | II | III | III | III | III |
40 C.F.R. §52.1821