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 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 This website is no longer updated and links to external websites and some internal pages may not work.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 (MATS)

Recent Actions

July 17, 2020 - EPA finalized minor revisions to the electronic reporting requirements for MATS. Learn more

May 22, 2020 - EPA published a final revised Supplemental Cost Finding for MATS and the Clean Air Act required “risk and technology review.” Learn more

April 15, 2020 - EPA published a MATS subcategory for certain existing units that fire coal refuse. Learn more

Mercury and Air Toxics Standards (MATS)

Cleaner Power Plants

Healthier Americans

Safer Environment

Jerome Bettis talks about asthma and the effects of air pollution.


Vídeo en español Exit

Public service announcement about the EPA's Mercury
and Air Toxics Standards

Vídeo en español Exit