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EPA/OAR RIN: 2060-AU65 Publication ID: Fall 2022 
Title: National Emission Standards for Hazardous Air Pollutants: Primary Magnesium Refining Residual Risk and Technology Review 

This action will address the agency’s residual risk and technology review (RTR) of the National Emission Standards for Hazardous Air Pollutants (NESHAP) for the Primary Magnesium Refining source category. This action will implement the residual risk review requirements of section 112(f)(2) of the Clean Air Act (CAA) and the technology review requirements of CAA section 112(d)(6). The current Primary Magnesium Refining NESHAP was promulgated pursuant to CAA section 112(d) on October 10, 2003. The NESHAP establishes emission limitations, work practice standards, and operation and maintenance requirements based on maximum achievable control technology (MACT) for controlling emissions of hazardous air pollutants (HAP) from the source category. The HAP emitted from this source category include, but are not limited to, hydrochloric acid, chlorine, dioxins and metal HAP. Pursuant to a court order (Community In-Power and Development Association, Inc. et al v. Pruitt, No. 1:16-cv-1074-KBJ (D.D.C. 2018)), the EPA is obligated to complete this final action by May 31, 2024.

Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 63   
Legal Authority: secs. 112 and 307(d)(7)(B) of the CAA as amended (42 U.S.C. 7412 and 7607(d)(7)(B)). This action is also subject to section 307(d) of the CAA (42 U.S.C. 7607(d)).   
Legal Deadline:
Action Source Description Date
Final  Judicial  1:16-cv-01074-KBJ; 03/31/22  05/31/2024 
Action Date FR Cite
NPRM  01/08/2021  86 FR 1390   
NPRM Comment Period Extended  02/23/2021  86 FR 10909   
Supplemental NPRM  09/00/2023 
Final Rule  06/00/2024 
Additional Information: EPA-HQ-OAR-2020-0535.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
Sectors Affected: 331410 Nonferrous Metal (except Aluminum) Smelting and Refining 
RIN Data Printed in the FR: No 
Agency Contact:
David Putney
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code D-243-02,
Research Triangle Park, NC 27711
Phone:919 541-2016
Fax:919 541-4991

Chuck French
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code D243-02,
Research Triangle Park, NC 27711
Phone:919 541-7912
Fax:919 541-4991