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assessments, and taking into account the recommendations of CASAC and public comments, <br />the EPA Administrator must judge whether it is appropriate to propose revisions to the <br />standards. <br />EPA undertakes an extensive public review and comment process, considering and analyzing <br />issues raised in public comments before announcing a final decision. As with every proposed <br />and final rule, all other relevant federal agencies are given the opportunity to participate in <br />the process. <br />• The law requires that the EPA Administrator set the primary standards at a level he judges to <br />be "requisite to protect the public health with an adequate margin of safety" and establish <br />secondary standards that are "requisite" to protect public welfare. The Clean Air Act defines <br />welfare as including environmental effects such as visibility impairment, damage to crops <br />and ecosystems, deterioration of manmade materials, among others. <br />• The Clean Air Act bars the Administrator from considering costs when setting the standards. <br />The U.S. Supreme Court upheld this requirement in a 2001 decision. <br />FOR MORE INFORMATION <br />Interested parties can download the notice from EPA's Web site at: <br />htip://www.epa. og v/air/particles/actions.html <br />