The North Dakota plan was evaluated on the basis of the following classifications: ----------------------------------------------------------------------------------------------------------------
Pollutant
----------------------------------------------------------
Air quality control region Photochemical
Particulate Sulfur Nitrogen Carbon oxidants
matter oxides dioxide monoxide (hydrocarbons)----------------------------------------------------------------------------------------------------------------Metropolitan Fargo-Moorhead Interstate............... II III III III IIINorth Dakota Intrastate.............................. II III III III III---------------------------------------------------------------------------------------------------------------- [37 FR 10885, May 31, 1972]