WTO notification · TBT
United StatesAdopted, according to its latest notice
Official title
National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units
The United States issued a correction on 17 April 2026 to the earlier TBT notification G/TBT/N/USA/1837. The measure was first notified on 23 February 2022. The comment period closed on 11 August 2025.
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Coal- and oil-fired electric utility steam generating units; Steam or other vapour generating boilers (excl. central heating hot water boilers capable also of producing low pressure steam); superheated water boilers; parts thereof; Quality; Air quality (ICS c
Proposed rule - In this action, the U.S. Environmental Protection Agency (EPA) is proposing to repeal 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 7 May 2024 (notified as G/TBT/N/USA/1837/Rev.1/Add.1). The amendments that the EPA is proposing to repeal include 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.
Every notice about this measure published here, newest first. Each one is the notifying member's own text.
CorrigendumG/TBT/N/USA/1837/Rev.2/Add.1/Corr.1
National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units: Final Repeal; Correction
The U.S. Environmental Protection Agency (EPA) is correcting a final rule that published in the Federal Register (FR) on 24 February 2026 (notified as G/TBT/N/USA/1837/Rev.2/Add.1), and will become effective on 27 April 2026. The EPA finalized 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 7 May 2024 ('MATS NESHAP'). This action corrects inadvertent typographical errors and minor omitted text in the Federal Register. The corrections described in this action do not affect the substantive requirements of the final rule that repeal specific amendments to the MATS NESHAP, promulgated on 7 May 2024. The correction is effective 27 April 2026. 91 Federal Register (FR) 20368, 16 April 2026; Title 40 Code of Federal Regulations (CFR) Part 63: This final rule; correction and previous actions notified under the symbol G/TBT/N/USA/1837 are identified by Docket Number EPA-HQ-OAR-2018-0794. The Docket Folder is available from Regulations.gov at and provides access to primary and supporting documents as well as comments received. Documents are also accessible from Regulations.gov by searching the Docket Number.
AddendumG/TBT/N/USA/1837/Rev.2/Add.1
National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units: Final Repeal
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 7 May 2024 (notified as G/TBT/N/USA/1837/Rev.1/Add.1). 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. The final rule is effective on 27 April 2026. The Director of the Federal Register (FR) approved incorporation by reference (IBR) of certain publications listed in the rule on 16 April 2012 and 30 May 2023. 91 Federal Register (FR) 9088, 24 February 2026; Title 40 Code of Federal Regulations (CFR) Part 63: This final rule and previous actions notified under the symbol G/TBT/N/USA/1837 are identified by Docket Number EPA-HQ-OAR-2018-0794. The Docket Folder is available from Regulations.gov at and provides access to primary and supporting documents as well as comments received. Documents are also accessible from Regulations.gov by searching…
RevisionG/TBT/N/USA/1837/Rev.2
Comment deadline: Closed on 11 August 2025
National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units
Proposed rule - In this action, the U.S. Environmental Protection Agency (EPA) is proposing to repeal 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 7 May 2024 (notified as G/TBT/N/USA/1837/Rev.1/Add.1). The amendments that the EPA is proposing to repeal include 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.
AddendumG/TBT/N/USA/1837/Rev.1/Add.1
National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units Review of the Residual Risk and Technology Review
This action finalizes amendments to the national emission standards for hazardous air pollutants (NESHAP) for the Coal- and Oil-Fired Electric Utility Steam Generating Units (EGUs) source category. These final amendments are the result of the EPA's review of the 2020 Residual Risk and Technology Review (RTR). The changes, which were proposed under the technology review in April 2023, include amending the filterable particulate matter (fPM) surrogate emission standard for non-mercury metal hazardous air pollutants (HAP) for existing coal-fired EGUs, the fPM emission standard compliance demonstration requirements, and the mercury (Hg) emission standard for lignite-fired EGUs. Additionally, the EPA is finalizing a change to the definition of 'startup.' The EPA did not propose, and is not finalizing, any changes to the 2020 Residual Risk Review. This final rule is effective on 8 July 2024. The incorporation by reference of certain material listed in the rule was approved by the Director of the Federal Register as of 16 April 2012. Title 40 Code of Federal Regulations (CFR) Part 63 This final rule and the proposed rule notified as G/TBT/N/USA/1837/Rev.1 are identified by Docket Number EPA-HQ-OAR-2018-0794. The Docket Folder is available from Regulations.gov at and provides access to primary and supporting documents as well as comments received. Documents are also accessible from Regulations.gov by searching the Docket Number.
RevisionG/TBT/N/USA/1837/Rev.1
Comment deadline: Closed on 23 June 2023
National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units--Revocation of the 2020 Reconsideration, and Affirmation of the Appropriate and Necessary Supplemental Finding
Proposed rule - The EPA is proposing to amend the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Coal- and Oil-Fired Electric Utility Steam Generating Units (EGUs), commonly known as the Mercury and Air Toxics Standards (MATS). Specifically, the EPA is proposing to amend the surrogate standard for non-mercury (Hg) metal HAP (filterable particulate matter (fPM)) for existing coal-fired EGUs; the fPM compliance demonstration requirements; the Hg standard for lignite-fired EGUs; and the definition of startup. These proposed amendments are the result of the EPA's review of the 22 May 2020 residual risk and technology review (RTR) of MATS.
AddendumG/TBT/N/USA/1837/Add.1
National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units--Revocation of the 2020 Reconsideration, and Affirmation of the Appropriate and Necessary Supplemental Finding
TITLE: National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units--Revocation of the 2020 Reconsideration and Affirmation of the Appropriate and Necessary Supplemental Finding AGENCY: Environmental Protection Agency (EPA) ACTION: Final action SUMMARY: After consideration of public comments, the EPA is revoking a 22 May 2020 finding that it is not appropriate and necessary to regulate coal- and oil-fired electric utility steam generating units (EGUs) under Clean Air Act (CAA) section 112, and concluding, as it did in its 25 April 2016 finding, that it remains appropriate and necessary to regulate hazardous air pollutant (HAP) emissions from EGUs after considering cost. DATES: This final agency action is effective 6 March 2023. This final action and the proposed rule notified as G/TBT/N/USA/1837 are identified by Docket Number EPA-HQ-OAR-2018-0794. The Docket Folder is available from Regulations.gov at and provides access to primary and supporting documents as well as comments received. Documents are also accessible from Regulations.gov by searching the Docket Number.
Regular notificationG/TBT/N/USA/1837
Comment deadline: Closed on 11 April 2022
National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units--Revocation of the 2020 Reconsideration, and Affirmation of the Appropriate and Necessary Supplemental Finding
Proposed rule - The EPA is proposing to revoke a 22 May 2020 finding that it is not appropriate and necessary to regulate coal- and oil-fired electric utility steam generating units (EGUs) under Clean Air Act (CAA) section 112, and to reaffirm the Agency's 25 April 2016 finding that it remains appropriate and necessary to regulate hazardous air pollutant (HAP) emissions from EGUs after considering cost. The Agency is also reviewing another part of the 22 May 2020 action, a residual risk and technology review (RTR) of Mercury and Air Toxics Standards (MATS). Accordingly, in addition to soliciting comments on all aspects of this proposal, the EPA is soliciting information on the performance and cost of new or improved technologies that control HAP emissions, improved methods of operation, and risk-related information to further inform the Agency's review of the MATS RTR as directed by Executive Order 13990.
Expodite writes its summary from the official record. The notification and the documents it notifies are on the WTO's own websites.
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