# National Emission Standards for Hazardous Air Pollutants for Source Categories
> **Rule** · — · Published 2004-06-02 · 69 FR 31008
## Document
- **Document number:** 04-55509
- **Category:** air-emissions
- **Federal Register citation:** 69 FR 31008
- **CFR reference:** 40 CFR 63
- **Publication date:** 2004-06-02
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2004/06/02/04-55509/national-emission-standards-for-hazardous-air-pollutants-for-source-categories)
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