Classification of regions.

The Connecticut plan was evaluated on the basis of the following classifications: Air quality control region Pollutant Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone New Jersey-New York-Connecticut Interstate I I I I I Hartford-New Haven-Springfield Interstate I I III I I Northwestern Intrastate III III III III III Eastern Intrastate II III III III III [37 FR 10855, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 45 FR 84787, Dec. 23, 1980]