# National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units: Final Repeal
> **Rule** · Final rule. · Published 2026-02-24 · Effective 2026-04-27 · 91 FR 9088
## Document
- **Document number:** 2026-03638
- **Category:** air-emissions
- **Federal Register citation:** 91 FR 9088
- **CFR reference:** 40 CFR 63
- **Publication date:** 2026-02-24
- **Effective date:** 2026-04-27
- **EPA docket:** EPA-HQ-OAR-2018-0794
## Abstract

The U.S. Environmental Protection Agency (EPA) is finalizing the repeal of specific amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Coal- and Oil-Fired Electric Utility Steam Generating Units (EGUs), commonly referred to as the Mercury and Air Toxics Standards (MATS), that were promulgated on May 7, 2024. Specifically, the EPA is repealing the revised filterable particulate matter (fPM) emission standard, which serves as a surrogate for non-mercury hazardous air pollutant (HAP) metals for existing coal- fired EGUs; the revised fPM emission standard compliance demonstration requirements; and the revised mercury (Hg) emission standard for lignite-fired EGUs. The EPA is also making technical, non-substantive clarifications to electronic reporting requirements.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/02/24/2026-03638/national-emission-standards-for-hazardous-air-pollutants-coal--and-oil-fired-electric-utility-steam)
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