40 C.F.R. § 52.471

Current through September 30, 2024
Section 52.471 - Classification of regions

The District of Columbia plan was evaluated on the basis of the following classifications:

Air quality control region Pollutant
Particulate matter Sulfur oxides Nitrogen dioxide Carbon monoxide Ozone
National Capital InterstateIIIIIII

40 C.F.R. §52.471

37 FR 10857, May 31, 1972, as amended at 39 FR 16346, May 8, 1974; 46 FR 61263, Dec. 16, 1981