Cite as: 531 U. S. 457 (2001)
Opinion of Breyer, J.
ments to the Act, introduced them by saying that Congress' primary responsibility in drafting the Act was not "to be limited by what is or appears to be technologically or economically feasible," but "to establish what the public interest requires to protect the health of persons," even if that means that "industries will be asked to do what seems to be impossible at the present time." 116 Cong. Rec. 32901-32902 (1970), 1 Legislative History of the Clean Air Amendments of 1970 (Committee Print compiled for the Senate Committee on Public Works by the Library of Congress), Ser. No. 93-18, p. 227 (1974) (hereinafter Leg. Hist.) (emphasis added). The Senate directly focused upon the technical feasibility and cost of implementing the Act's mandates. And it made clear that it intended the Administrator to develop air quality standards set independently of either. The Senate Report for the 1970 amendments explains:
"In the Committee discussions, considerable concern was expressed regarding the use of the concept of technical feasibility as the basis of ambient air standards. The Committee determined that 1) the health of people is more important than the question of whether the early achievement of ambient air quality standards protective of health is technically feasible; and, 2) the growth of pollution load in many areas, even with application of available technology, would still be deleterious to public health. . . .
"Therefore, the Committee determined that existing sources of pollutants either should meet the standard of the law or be closed down . . . ." S. Rep. No. 91-1196, pp. 2-3 (1970), 1 Leg. Hist. 402-403 (emphasis added).
Indeed, this Court, after reviewing the entire legislative history, concluded that the 1970 amendments were "expressly designed to force regulated sources to develop pollution control devices that might at the time appear to be economically or technologically infeasible." Union Elec. Co.
491
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