# National Emission Standards for Hazardous Air Pollutants: Petroleum Refineries
> **Rule** · Direct final rule. · Published 1997-02-21 · Effective 1997-04-22 · 62 FR 7937
## Document
- **Document number:** 97-4326
- **Category:** air-emissions
- **Federal Register citation:** 62 FR 7937
- **CFR reference:** 40 CFR 63
- **Publication date:** 1997-02-21
- **Effective date:** 1997-04-22
- **EPA docket:** AD-FRL-5690-9
## Abstract

This action expands and clarifies definitions in the ``National Emission Standards for Hazardous Air Pollutants: Petroleum Refineries,'' which was issued as a final rule on August 18, 1995.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/02/21/97-4326/national-emission-standards-for-hazardous-air-pollutants-petroleum-refineries)
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