An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Primary Zinc Smelters: New Source Performance Standards

On this page:

Rule Summary

Pursuant to section 111 of the Clean Air Act, the EPA promulgated standards of performance for new and modified sources of primary zinc smelters. The final standards limit emissions of particulate matter from sintering machines to 50 mg/dscm (0.022 gr/dscf). The opacity of the exhaust gases is limited to 20 percent.

Rule History

05/25/1983 - Final rule.

01/26/1981 - Proposed rule and notice of public hearing.

01/15/1976 - Final rule.

10/16/1974 - Proposed rule.