Mercury and Air Toxics Standards (MATS)
Protecting our children and communities by limiting emissions of mercury and other air toxics from power plants.
EPA is no longer updating the content on this page and links may not function; however, the materials on this page may be useful as background to supplement current information or to provide an historical perspective.
Current information is available at: https://www.epa.gov/stationary-sources-air-pollution/mercury-and-air-toxics-standards
- Power plants are the biggest source of mercury
Power plants are currently the dominant emitters of mercury, acid gases and many toxic metals in the U.S. Read more
- Existing technology can remove toxics
Controls to meet limits are widely available. Learn more
- Plants have time to meet the standards
It is several years before plants need to comply. Learn more
- Rule will improve public health
Benefits total $37 billion to $90 billion each year. Read more
- MATS reduces toxic pollution
Toxics from fossil fuel-fired power plants cause serious health impacts. Learn more
- Power plant pollution and health effects
Methylmercury exposure is a particular concern for women of childbearing age, unborn babies, and young children. Learn more.
- Healthier lakes, streams and fish
Power plant emissions damage our environment and pollute our nation's lakes and streams. Read more
- Less mercury contamination
Mercury contamination affects populations of numerous fish species, waterfowl and mammals that eat fish. Learn more
- Improved visibility
Pollution from power plants degrades visibility where we live, work and travel. Learn more.
July 17, 2020 - EPA finalized minor revisions to the electronic reporting requirements for MATS.
May 22, 2020 - EPA published a final revised Supplemental Cost Finding for MATS and the Clean Air Act required “risk and technology review.”
April 15, 2020 - EPA published a MATS subcategory for certain existing units that fire coal refuse.