An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Mercury and Air Toxics Standards

EPA Proposes Supplemental Finding About MATS and Costs

November 20, 2015 – After assessing costs in several different ways, EPA is proposing to find that considering costs does not alter the determination that it is appropriate to regulate the emissions of toxic air pollution from power plants. EPA is proposing this supplemental finding in response to a decision by the U.S. Supreme Court. 

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.