Section, act July 14, 1955, ch. 360, title III, § 316, formerly § 13, as added Dec. 17, 1963, Pub. L. 88–206, § 1, 77 Stat. 401; renumbered title III, § 306, and amended Oct. 20, 1965, Pub. L. 89–272, title I, § 101(4), (6), (7), 79 Stat. 992; Oct. 15, 1966, Pub. L. 89–675, § 2(a), 80 Stat. 954; renumbered § 309 and amended Nov. 21, 1967, Pub. L. 90–148, § 2, 81 Stat. 506; renumbered § 316 and amended Dec. 31, 1970, Pub. L. 91–604, §§ 12(a), 13(b), 84 Stat. 1705, 1709; Apr. 9, 1973, Pub. L. 93–15, § 1(c), 87 Stat. 11; June 22, 1974, Pub. L. 93–319, § 13(c), 88 Stat. 265, authorized appropriations for air pollution control. See section 7626 of this title.