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Summary: EPA is repealing specific amendments to the NESHAP for Coal- and Oil-Fired Electric Utility Steam Generating Units (also known as the Mercury and Air Toxics Standard) that were published on May 7, 2024 (89 FR 38508). Repealed are the revised filterable particulate matter (fPM) emission standard for existing coal-fired EGUs, the revised fPM compliance demonstration requirement for all coal- and oil-fired EGUs, and the revised mercury emission standard for lignite-fired EGUs. [Full Text – 91 FR 9088]
Citations: 40 CFR 63, Subpart UUUUU
Date Posted: 2/24/2026
Date Effective: 4/27/2026
Type of Action: Final Rule
