National Emission Standards for Hazardous Air Pollutants: Chemical Manufacturing Area Sources Technology Review

Abstract

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.

Action & Dates

Action: Final rule.
Dates: This final rule is effective on April 1, 2026. The Director of the Federal Register (FR) has approved incorporation by reference of certain publications listed in the rule as of April 1, 2026.
Effective Date: 2026-04-01

CFR References

40 CFR Part 63

Topics

Administrative practice and procedureAir pollution controlEnvironmental protectionHazardous substancesIncorporation by referenceIntergovernmental relationsReporting and recordkeeping requirements

Document Excerpt

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Environmental Protection Agency 40 CFR Part 63 [EPA-HQ-OAR-2024-0303; FRL-7623-02-OAR] RIN 2060-AU73 ( printed page 16502) AGENCY: Environmental Protection Agency (EPA). ACTION: Final rule. SUMMARY: 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. DATES: This final rule is effective on April 1, 2026. The Director of the Federal Register (FR) has approved incorporation by reference of certain publications listed in the rule as of April 1, 2026. ADDRESSES: The EPA established a docket for this action under Docket ID No. EPA-HQ-OAR-2024-0303. All documents in the docket are available at https://www.reg…

Read full document on FederalRegister.gov →

Full Document

View on FederalRegister.gov →Download PDF →

Citation: 91 FR 16502