# National Emission Standards for Hazardous Air Pollutants for Source Categories
> **Rule** · — · Published 2006-06-23 · 71 FR 36014
## Document
- **Document number:** 06-55523
- **Category:** air-emissions
- **Federal Register citation:** 71 FR 36014
- **CFR reference:** 40 CFR 63
- **Publication date:** 2006-06-23
## Source
- [Federal Register document](https://www.federalregister.gov/documents/2006/06/23/06-55523/national-emission-standards-for-hazardous-air-pollutants-for-source-categories)
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