By Andrew H. Perellis and Patrick D. Joyce

Supreme CourtIn a 5-4 ruling, the U.S. Supreme Court today ruled that the EPA acted unreasonably when it refused to consider the cost of implementing its Mercury and Air Toxics Standard (MATS).

The MATS rule, issued in 2012, established emissions limits from power plants for mercury, filterable particulate matter, and hydrogen chloride. 

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