# National Emission Standards for Hazardous Air Pollutants for the Polyether Polyols Production Industry: Removal of Affirmative Defense
> **Rule** · Final rule. · Published 2025-09-02 · Effective 2025-09-02 · 90 FR 42323
## Document
- **Document number:** 2025-16744
- **Category:** air-emissions
- **Federal Register citation:** 90 FR 42323
- **CFR reference:** 40 CFR 63
- **Publication date:** 2025-09-02
- **Effective date:** 2025-09-02
- **EPA docket:** EPA-HQ-OAR-2023-0509
## Abstract

The U.S. Environmental Protection Agency (EPA) is finalizing amendments to the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Polyether Polyols (PEPO) Production under the Clean Air Act (CAA). Specifically, for this NESHAP, the EPA is finalizing the removal of affirmative defense provisions associated with the violation of air emission standards due to malfunctions.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2025/09/02/2025-16744/national-emission-standards-for-hazardous-air-pollutants-for-the-polyether-polyols-production)
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