Opinion for the Court filed by Senior Circuit Judge BAZELON.
BAZELON, Senior Circuit Judge:
In 1971, pursuant to the Clean Air Amendments of 1970, Pub.L.No. 91-604, 84 Stat. 1679, the Administrator of the Environmental Protection Agency (EPA) promulgated a series of national ambient air quality standards, known as the NAAQS, for sulfur oxides. The standards established maximum acceptable average concentrations for one-year periods, 24-hour periods, and 3-hour...
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