40 C.F.R. § 52.621

Classification of regions.

Last amended: 2016Year: 2026Length: 42 wordsOfficial source

Cite as 40 C.F.R. § 52.621 (2026)

The Hawaii 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) State of Hawaii II III III III III [37 FR 10860, May 31, 1972]
40 C.F.R. § 52.621: Classification of regions. | Justis AI