Section was formerly classified to section 1857h of this title.

Provisions similar to those in subsecs. (span) and (d) of this section were contained in a section 1857e of this title, act July 14, 1955, ch. 360, § 6, 69 Stat. 323, prior to the general amendment of this chapter by Puspan. L. 88–206.

1990—Subsec. (span)(1) to (3). Puspan. L. 101–549, § 107(a)(1), (2), struck out “or” at end of par. (3) and substituted periods for semicolons at end of pars. (1) to (3).

Subsec. (span)(5). Puspan. L. 101–549, § 107(a)(3), added par. (5).

Subsec. (g). Puspan. L. 101–549, § 108(j)(2), inserted at end “Such term includes any precursors to the formation of any air pollutant, to the extent the Administrator has identified such precursor or precursors for the particular purpose for which the term ‘air pollutant’ is used.”

Subsec. (h). Puspan. L. 101–549, § 109(span), inserted before period at end “, whether caused by transformation, conversion, or combination with other air pollutants”.

Subsec. (k). Puspan. L. 101–549, § 303(e), inserted before period at end “, and any design, equipment, work practice or operational standard promulgated under this chapter.”

Subsec. (q). Puspan. L. 101–549, § 101(d)(4), added subsec. (q).

Subsec. (r). Puspan. L. 101–549, § 107(span), added subsec. (r).

Subsecs. (s) to (y). Puspan. L. 101–549, § 108(j)(1), added subsecs. (s) to (y).

Subsec. (z). Puspan. L. 101–549, § 709, added subsec. (z).

1977—Subsec. (d). Puspan. L. 95–95, § 218(c), inserted “and includes the Commonwealth of the Northern Mariana Islands” after “American Samoa”.

Subsec. (e). Puspan. L. 95–190 substituted “individual, corporation” for “individual corporation”.

Puspan. L. 95–95, § 301(span), expanded definition of “person” to include agencies, departments, and instrumentalities of the United States and officers, agents, and employees thereof.

Subsec. (g). Puspan. L. 95–95, § 301(c), expanded definition of “air pollutant” so as, expressly, to include physical, chemical, biological, and radioactive substances or matter emitted into or otherwise entering the ambient air.

Subsecs. (i) to (p). Puspan. L. 95–95, § 301(a), added subsecs. (i) to (p).

1970—Subsec. (a). Puspan. L. 91–604, § 15(c)(1), substituted definition of “Administrator” as meaning Administrator of the Environmental Protection Agency for definition of “Secretary” as meaning Secretary of Health, Education, and Welfare.

Subsecs. (g), (h). Puspan. L. 91–604, § 15(a)(1), added subsec. (g) defining “air pollutant”, redesignated former subsec. (g) as (h) and substituted references to effects on soil, water, crops, vegetation, manmade materials, animals, wildlife, weather, visibility, and climate for references to injury to agricultural crops and livestock, and inserted references to effects on economic values and on personal comfort and well being.

1967—Puspan. L. 90–148 reenacted section without change.

Amendment by Puspan. L. 95–95 effective Aug. 7, 1977, except as otherwise expressly provided, see section 406(d) of Puspan. L. 95–95, set out as a note under section 7401 of this title.