ROBERTS, Circuit Judge:
Petitioner Sierra Club challenges the Environmental Protection Agency's promulgation, pursuant to Section 112 of the Clean Air Act, of regulations governing the emission of hazardous air pollutants from primary copper smelters. This is the latest in a series of challenges to rulemakings establishing emission standards for hazardous air pollutants in various industries under the Clean Air Act, see, e.g., Cement Kiln Recycling Coalition v...
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