# National Emission Standards for Hazardous Air Pollutants for Reciprocating Internal Combustion Engines
> **Rule** · Final rule. · Published 2010-03-03 · Effective 2010-05-03 · 75 FR 9648
## Document
- **Document number:** 2010-3508
- **Category:** air-emissions
- **Federal Register citation:** 75 FR 9648
- **CFR reference:** 40 CFR 63
- **Publication date:** 2010-03-03
- **Effective date:** 2010-05-03
- **EPA docket:** EPA-HQ-OAR-2008-0708, FRL-9115-7
## Abstract

EPA is promulgating national emission standards for hazardous air pollutants for existing stationary compression ignition reciprocating internal combustion engines that either are located at area sources of hazardous air pollutant emissions or that have a site rating of less than or equal to 500 brake horsepower and are located at major sources of hazardous air pollutant emissions. In addition, EPA is promulgating national emission standards for hazardous air pollutants for existing non-emergency stationary compression ignition engines greater than 500 brake horsepower that are located at major sources of hazardous air pollutant emissions. Finally, EPA is revising the provisions related to startup, shutdown, and malfunction for the engines that were regulated previously by these national emission standards for hazardous air pollutants.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2010/03/03/2010-3508/national-emission-standards-for-hazardous-air-pollutants-for-reciprocating-internal-combustion)
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