BRIEF-Potash Corp units settle U.S. Clean Air Act case over sulfur dioxide emissions
Nov 6 (Reuters) - Potash Corporation of Saskatchewan Inc : * U.S. says Potash Corporation of Saskatchewan Inc units agree to cut
harmful air emissions, spend $50 million on improvements, pay $1.3 million
civil penalty * U.S. Department of Justice says accord resolves claims that three Potash
units violated clean air act by modifying plants in ways that caused excess
sulfur dioxide emissions * Justice Department calls the settlement its largest in clean air act
enforcement efforts against sulfuric acid producers
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