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UPDATE 3-US Supreme Court won't hear challenge to EPA rulemaking

* Court order a victory for Obama administration * Grupo Mexico unit objected to sulfur dioxide standard * Sulfur dioxide linked to respiratory problems By Jonathan Stempel WASHINGTON, Jan 22 (Reuters) - The U.S. Supreme Court refused on Tuesday to consider reducing the Environmental Protection Agency's authority to set air quality standards, leaving intact a tough new limit on sulfur dioxide emissions in a victory for the Obama administration.

US top court rejects Asarco challenge to EPA rule

WASHINGTON, Jan 22 (Reuters) - The U.S. Supreme Court on Tuesday refused to consider an appeal by Asarco LLC over how much authority a top federal environmental regulator should have in setting air quality standards. Asarco LLC, which operates one of the three main U.S. copper smelters, was appealing a July decision by the D.C. Circuit Court of Appeals upholding the Environmental Protection Agency's new national ambient air quality standard for sulfur dioxide.
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