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

What it does

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.

The Environmental Protection Agency's summary, as published in the Federal Register.

What changed in the regulation

1 part of Title 40 of the Code of Federal Regulations:

40 CFR 63

Wording on eCFR: the day before it took effect and from the day it took effect (first part listed).

Compared with

The Environmental Protection Agency has published 245 final rules in 2026 so far, compared with 263 in all of 2025.

Counted by the Tribune from Federal Register records since Jan. 1, 2025.

Before this

2 earlier Federal Register documents under regulation identifier 2060-AU73 since Jan. 1, 2025.

• March 20, 2025 Proposed rule; extension of public comment period. National Emission Standards for Hazardous Air Pollutants: Chemical Manufacturing Area Sources Technology Review; Comment Period Extension
• Jan. 22, 2025 Proposed rule. National Emission Standards for Hazardous Air Pollutants: Chemical Manufacturing Area Sources Technology Review

What happens next and when

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.

The agency's dates, word for word.

Check it yourself

• The document in the Federal Register
• Docket EPA-HQ-OAR-2024-0303 on Regulations.gov
• Title 40 on eCFR

The record as published

Source: the Federal Register (public domain). The document in the Federal Register