U.S.C. Title 42 - THE PUBLIC HEALTH AND WELFARE 42 U.S.C. United States Code, 2023 Edition 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 From the U.S. Government Publishing Office, www.gpo.gov

§7472. Initial classifications

(a) Areas designated as class I Upon the enactment of this part, all— (1) international parks, (2) national wilderness areas which exceed 5,000 acres in size, (3) national memorial parks which exceed 5,000 acres in size, and (4) national parks which exceed six thousand acres in size,

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. (b) Areas designated as class II 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.)

Editorial Notes

Amendments 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".