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NACAA submitted comments on EPA’s proposal to update 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 (MATS), which was proposed on April 24, 2023. NACAA expressed support for EPA’s efforts to make improvements to the existing MATS, specifically endorsing measures to strengthen the surrogate standard for non-mercury metal hazardous air pollutants (HAPs) by lowering the filterable particulate matter (fPM) standard and requirements for lignite-fired EGUs to meet the same mercury emission standard as non-lignite EGUs. NACAA also articulated a need for improvements to continuous emission monitor (CEMs) technology if EPA wishes to require CEMs for demonstrations of compliance for the proposed fPM standards. Finally, NACAA suggested EPA retain the typical three-year schedule for compliance.
For further information: https://www.4cleanair.org/wp-content/uploads/MATS-Letter-NACAA-June-22-2023.pdf and https://www.epa.gov/stationary-sources-air-pollution/mercury-and-air-toxics-standards
