# Amendments to National Emission Standards for Hazardous Air Pollutants for Primary Copper Smelting and Secondary Copper Smelting Area Sources
> **Rule** · Direct final rule. · Published 2007-07-03 · Effective 2007-10-01 · 72 FR 36363
## Document
- **Document number:** E7-12847
- **Category:** air-emissions
- **Federal Register citation:** 72 FR 36363
- **CFR reference:** 40 CFR 63
- **Publication date:** 2007-07-03
- **Effective date:** 2007-10-01
- **EPA docket:** EPA-HQ-OAR-2006-0510
## Abstract

EPA is taking direct final action to amend the national emission standards for primary copper smelting area sources and secondary copper smelting area sources published on January 23, 2007. The amendments to the national emission standards for primary copper smelting area sources clarify when plants must exhaust gases to a control device and what control devices may be used for this requirement; numbering errors are also corrected. The amendments to the national emission standards for secondary copper smelting area sources clarify the date which defines a new copper smelter and correct a cross-referencing error.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2007/07/03/E7-12847/amendments-to-national-emission-standards-for-hazardous-air-pollutants-for-primary-copper-smelting)
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