Data / Federal rules / 2025-00685
National Emission Standards for Hazardous Air Pollutants: Chemical Manufacturing Area Sources Technology Review
The Environmental Protection Agency published this proposed rule in the Federal Register on January 22, 2025. Comments closed on March 24, 2025.
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What the agency says
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.
Key facts
- Document number
- 2025-00685
- Type
- Proposed rule
- Action
- Proposed rule
- Agency
- Environmental Protection Agency
- Published
- January 22, 2025
- Comments due
- March 24, 2025
- Dates
- Comments. Comments must be received on or before March 24, 2025. Under the Paperwork Reduction Act (PRA), comments on the information collection provisions are best assured of consideration if the Office of Management and Budget (OMB) receives a copy of your comments on or before February 21, 2025.
- Docket
- EPA-HQ-OAR-2024-0303; FRL-7623-01-OAR
- Regulation ID (RIN)
- 2060-AU73
- Code of Federal Regulations
- 40 CFR 63
- Topics
- Air pollution control; Environmental protection; Hazardous substances; Incorporation by reference; Reporting and recordkeeping requirements
- Pages
- 50
Other documents from the Environmental Protection Agency
Everything from the Environmental Protection Agency · Rules on air pollution control · Rules on environmental protection · Rules on hazardous substances · Published in January 2025
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