# National Emission Standards for Hazardous Air Pollutants for Source Categories
> **Rule** · Interpretative rule. · Published 2000-04-21 · Effective 2000-04-21 · 65 FR 21363
## Document
- **Document number:** 00-9925
- **Category:** air-emissions
- **Federal Register citation:** 65 FR 21363
- **CFR reference:** 40 CFR 63
- **Publication date:** 2000-04-21
- **Effective date:** 2000-04-21
- **EPA docket:** AD-FRL-6582-3
## Abstract

This action clarifies that all stationary combustion turbines are subject to the provisions of Subpart B--Requirements for Control Technology Determinations for Major Sources in Accordance with Clean Air Act Sections 112(g) and 112(j) (i.e., case-by-case maximum achievable control technology (MACT) determinations).

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/04/21/00-9925/national-emission-standards-for-hazardous-air-pollutants-for-source-categories)
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