WTO notification · TBT
United StatesAdopted, according to its latest notice
Official title
National Emission Standards for Hazardous Air Pollutants: Chemical Manufacturing Area Sources Technology Review
The United States issued an addendum on 2 April 2026 to the earlier TBT notification G/TBT/N/USA/2185. Addenda often report that a measure was adopted, changed, postponed or withdrawn. The measure was first notified on 24 January 2025. The comment period closed on 14 April 2025.
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Chemical manufacturing process units (CMPUs) using ethylene oxide (EtO); pressure vessels and pressure relief devices (PRDs); Environmental protection; Mechanical testing; Boilers and heat exchangers; Production in the chemical ind
Latest notice (G/TBT/N/USA/2185/Add.2, 2 April 2026)
The latest notice says the measure was adopted or published.
National Emission Standards for Hazardous Air Pollutants: Chemical Manufacturing Area Sources Technology Review
Final rule - The Environmental Protection Agency (EPA) is finalizing amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for the Chemical Manufacturing Area Source (CMAS) categories pursuant to a technology review under Clean Air Act (CAA) section 112(d)(6). Specifically, the EPA is finalizing new leak detection and repair (LDAR) requirements for equipment leaks and heat exchange systems in organic hazardous air pollutant (HAP) service. In addition, the EPA is taking final action to add standards for pressure relief devices (PRDs) and pressure vessels; require electronic reporting for notification of compliance status (NOCS), performance test reports, and periodic reports; and require continuous performance testing of non-flare air pollution control devices (APCD). The EPA is not finalizing the proposed area source category for chemical manufacturing with ethylene oxide (EtO) or related standards at this time. This final rule is effective on 1 April 2026. The Director of the Federal Register (FR) has approved incorporation by reference of certain publications listed in the rule as of 1 April 2026. 91 Federal Register (FR) 16502, 1 April 2026; Title 40 Code of Federal Regulations (CFR) Part 63: This final rule and previous actions notified under the symbol G/TBT/N/USA/2185 are identified by Docket Number EPA-HQ-OAR-2024-0303. The Docket Folder is available on Regulations.gov at and provides access to primary and supporting documents as well as…
Proposed rule - The Environmental Protection Agency (EPA) is proposing to establish a new area source category to address chemical manufacturing process units (CMPUs) using ethylene oxide (EtO). The EPA is proposing to list EtO in table 1 to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Chemical Manufacturing Area Sources (referred to as the CMAS NESHAP in this document) and to add EtO-specific requirements to the CMAS NESHAP. The EPA is also proposing to add a fenceline monitoring program for EtO. In addition, the EPA is proposing new requirements for pressure vessels and pressure relief devices (PRDs). This proposal also presents the results of the EPA's technology review of the CMAS NESHAP as required under the Clean Air Act (CAA). As part of this technology review, the EPA is proposing to add new leak detection and repair (LDAR) requirements to the CMAS NESHAP for equipment leaks in organic HAP service and heat exchange systems. The EPA is also proposing performance testing once every 5 years and to add provisions for electronic reporting. We estimate that the proposed amendments to the CMAS NESHAP, excluding the proposed EtO emission standards, would reduce hazardous air pollutant (HAP) emissions from emission sources by approximately 158 tons per year (tpy). Additionally, the proposed EtO emission standards are expected to reduce EtO emissions by approximately 4.6 tpy. If anyone contacts EPA requesting a public hearing on or before 27…
Every notice about this measure published here, newest first. Each one is the notifying member's own text.
AddendumG/TBT/N/USA/2185/Add.2
National Emission Standards for Hazardous Air Pollutants: Chemical Manufacturing Area Sources Technology Review
Final rule - The Environmental Protection Agency (EPA) is finalizing amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for the Chemical Manufacturing Area Source (CMAS) categories pursuant to a technology review under Clean Air Act (CAA) section 112(d)(6). Specifically, the EPA is finalizing new leak detection and repair (LDAR) requirements for equipment leaks and heat exchange systems in organic hazardous air pollutant (HAP) service. In addition, the EPA is taking final action to add standards for pressure relief devices (PRDs) and pressure vessels; require electronic reporting for notification of compliance status (NOCS), performance test reports, and periodic reports; and require continuous performance testing of non-flare air pollution control devices (APCD). The EPA is not finalizing the proposed area source category for chemical manufacturing with ethylene oxide (EtO) or related standards at this time. This final rule is effective on 1 April 2026. The Director of the Federal Register (FR) has approved incorporation by reference of certain publications listed in the rule as of 1 April 2026. 91 Federal Register (FR) 16502, 1 April 2026; Title 40 Code of Federal Regulations (CFR) Part 63: This final rule and previous actions notified under the symbol G/TBT/N/USA/2185 are identified by Docket Number EPA-HQ-OAR-2024-0303. The Docket Folder is available on Regulations.gov at and provides access to primary and supporting documents as well as…
AddendumG/TBT/N/USA/2185/Add.1
Comment deadline: Closed on 14 April 2025
National Emission Standards for Hazardous Air Pollutants: Chemical Manufacturing Area Sources Technology Review
On 22 January 2025, the U.S. Environmental Protection Agency (EPA) proposed a rule titled 'National Emission Standards for Hazardous Air Pollutants: Chemical Manufacturing Area Sources Technology Review' (notified as G/TBT/N/USA/2185) The EPA is extending the comment period on this proposed rule, which was scheduled to close on 24 March 2025. The comment period will now remain open until 14 April 2025, to allow additional time for stakeholders to review and comment on the proposal. The public comment period for the proposed rule published in the Federal Register (FR) on 22 January 2025, (90 FR 7942) is being extended by 21 days. Written comments must now be received on or before 14 April 2025. 90 Federal Register (FR) 13116, 20 March 2025; Title 40 Code of Federal Regulations (CFR) Part 63: This extension of public comment period and the proposed rule notified as G/TBT/N/USA/2185 are identified by Docket Number EPA-HQ-OAR-2024-0303. The Docket Folder is available on 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. WTO Members and their stakeholders are asked to submit comments to the USA TBT Enquiry Point by or before 4pm Eastern Time on 14 April 2025. Comments received by the USA TBT Enquiry Point from WTO Members and their stakeholders will be shared with EPA and will also be submitted to the Docket on Regulations.gov if received…
Regular notificationG/TBT/N/USA/2185
Comment deadline: Closed on 24 March 2025
National Emission Standards for Hazardous Air Pollutants: Chemical Manufacturing Area Sources Technology Review
Proposed rule - The Environmental Protection Agency (EPA) is proposing to establish a new area source category to address chemical manufacturing process units (CMPUs) using ethylene oxide (EtO). The EPA is proposing to list EtO in table 1 to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Chemical Manufacturing Area Sources (referred to as the CMAS NESHAP in this document) and to add EtO-specific requirements to the CMAS NESHAP. The EPA is also proposing to add a fenceline monitoring program for EtO. In addition, the EPA is proposing new requirements for pressure vessels and pressure relief devices (PRDs). This proposal also presents the results of the EPA's technology review of the CMAS NESHAP as required under the Clean Air Act (CAA). As part of this technology review, the EPA is proposing to add new leak detection and repair (LDAR) requirements to the CMAS NESHAP for equipment leaks in organic HAP service and heat exchange systems. The EPA is also proposing performance testing once every 5 years and to add provisions for electronic reporting. We estimate that the proposed amendments to the CMAS NESHAP, excluding the proposed EtO emission standards, would reduce hazardous air pollutant (HAP) emissions from emission sources by approximately 158 tons per year (tpy). Additionally, the proposed EtO emission standards are expected to reduce EtO emissions by approximately 4.6 tpy. If anyone contacts EPA requesting a public hearing on or before 27…
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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