Classification of regions.

The New Jersey 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) New Jersey-New York-Connecticut Interstate I I I I I Metropolitan Philadelphia Interstate I I III I I Northeast Pennsylvania-Upper Delaware Valley Interstate I II III III III New Jersey Intrastate III IA III I III [37 FR 10880, May 31, 1972, as amended at 39 FR 16347, May 8, 1974]