Mercury and Air Toxics Standards
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In the National Emission Standards for Hazardous Air Pollutants for Coal- and Oil-Fired Electric Utility Steam Generating Units (EGUs), also known as the Mercury and Air Toxics Standards or MATS, EPA set technology-based emissions standards for mercury and other hazardous air pollutants (HAP) emitted by units with a capacity of more than 25 megawatts. These standards reflect levels achieved by the best-performing sources and apply to existing and new EGUs.
MATS, along with significant changes in the power sector, has achieved significant health and environmental benefits by reducing a broad range of hazardous air pollutants. By 2017 mercury emissions had dropped by 86 percent - down to approximately 4 tons. Acid gas HAP and non-mercury metals are down 96 percent and 81 percent respectively when compared to 2010 levels.
07/17/2020 - Final Electronic Reporting Provisions
04/03/2020 - Proposed Electronic Reporting Revisions
08/08/2016 - Denials of Petitions for Reconsideration – Startup and Shutdown Provisions
- Notice of Final Action Denying Reconsideration on the MATS Startup and Shutdown Provisions
- Denial Document for Reconsideration of Certain Startup and Shutdown Issues; MATS
04/14/2016 - Final Supplemental Finding about MATS and Costs
03/17/2016 - Final Technical Corrections
11/20/2015 - Proposed Supplemental Finding about MATS and Costs
03/09/2015 - Interim Final Electronic Reporting Requirements
12/19/2014 - Proposed Technical Corrections
11/07/2014 - Final Updates to the Startup and Shutdown Provisions
03/28/2013 - Final Updates to the Standards for New Power Plants