2020 US Code
Title 42 - The Public Health and Welfare
Chapter 85 - Air Pollution Prevention and Control
Subchapter I - Programs and Activities
Part C - Prevention of Significant Deterioration of Air Quality
Subpart i - Clean Air
Sec. 7472 - Initial classifications

Upon the enactment of this part, all—

and which are in existence on August 7, 1977, shall be class I areas and may not be redesignated. All areas which were redesignated as class I under regulations promulgated before August 7, 1977, shall be class I areas which may be redesignated as provided in this part. The extent of the areas designated as Class I under this section shall conform to any changes in the boundaries of such areas which have occurred subsequent to August 7, 1977, or which may occur subsequent to November 15, 1990.

All areas in such State designated pursuant to section 7407(d) of this title as attainment or unclassifiable which are not established as class I under subsection (a) shall be class II areas unless redesignated under section 7474 of this title.

(July 14, 1955, ch. 360, title I, §162, as added Pub. L. 95–95, title I, §127(a), Aug. 7, 1977, 91 Stat. 731; amended Pub. L. 95–190, §14(a)(40), Nov. 16, 1977, 91 Stat. 1401; Pub. L. 101–549, title I, §§108(m), 110(2), Nov. 15, 1990, 104 Stat. 2469, 2470.)

1990—Subsec. (a). Pub. L. 101–549, §108(m), inserted at end "The extent of the areas designated as Class I under this section shall conform to any changes in the boundaries of such areas which have occurred subsequent to August 7, 1977, or which may occur subsequent to November 15, 1990."

Subsec. (b). Pub. L. 101–549, §110(2), substituted "designated pursuant to section 7407(d) of this title as attainment or unclassifiable" for "identified pursuant to section 7407(d)(1)(D) or (E) of this title".

1977—Subsec. (a)(4). Pub. L. 95–190 inserted a comma after "size".