Primary Magnesium Refining: National Emissions Standards for Hazardous Air Pollutants (NESHAP)
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Rule Summary
This action promulgates national emission standards for hazardous air pollutants (NESHAP) for primary magnesium refining facilities. The EPA has identified primary magnesium refining facilities as a major source of hazardous air pollutant (HAP)
emissions. The NESHAP implement section 112(d) of the Clean Air Act (CAA) by requiring all major sources to meet HAP emission standards reflecting application of the maximum achievable control technology (MACT).
The HAP emitted by facilities in the primary magnesium refining source category include chlorine, hydrochloric acid, dioxin/furan, and trace amounts of several HAP metals. Exposure to these substances has been demonstrated to cause adverse health effects, including chronic and acute disorders of the blood, heart, kidneys, reproductive system, and central nervous system. Some of these pollutants are considered to be carcinogens, and all can cause toxic effects in humans following sufficient exposure.
Rule History
02/12/2021 - Pre-publication proposed rule; extension of public comment period (pdf) (237 KB)
01/08/2021 - Proposed rule (January 2021) | Proposed rule edits
10/10/2003 - Final rule (pdf) (187 KB)
01/22/2003 - Proposed rule (January 2003) (pdf) (204 KB)
01/03/2003 - Notice of availability of proposed rules and changes to public comment periods (pdf) (136 KB)
Additional Resources
Fact Sheet: Proposed Amendments to Air Toxics Standards for Primary Magnesium Refining
Public Comment Review Tool for Primary Magnesium Refining RTR modeling file (zip) . To use this tool, please download the file to your computer and unzip, then follow the instructions in the included PDF file.