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Regulatory Development and Retrospective Review Tracker

National Emission Standards for Hazardous Air Pollutants: Primary Aluminum Reduction Plants

a.k.a. NESHAP RTR for Primary Aluminum Reduction Plants (subpart LL)

RIN: 2060-AQ92 (What's this?)

Docket No.: EPA-HQ-OAR-2011-0797 (What's this?)

Current Phase: Proposal (What's this?)

The Clean Air Act (CAA) requires EPA to review maximum achievable control technology (MACT) standards and to revise them "as necessary (taking into account developments in practices, processes and control technologies)" no less frequently than every 8 years.

Under the "residual risk" provision of the CAA, EPA must evaluate the MACT standards within 8 years after promulgation and promulgate standards, if required, to provide an ample margin of safety to protect public health or prevent an adverse environmental effect while considering the economic impacts of controls, technological feasibility, uncertainties and any other relevant factors. The EPA promulgated National Emission Standards for Hazardous Air Pollutants (NESHAP) for Primary Aluminum Reduction Plants (found in 40 CFR Part 63, Subpart LL) in 1997. This NESHAP applies to the owner or operator of each new pitch storage tank or new or existing potline, paste production plant, or anode bake furnace associated with primary aluminum reduction which is located at a major source, as defined in 40 CFR Section 63.2. The EPA proposed standards addressing residual risk and technology developments on December 6, 2011. If finalized, the proposed amendments would include new emissions standards for carbonyl sulfide emissions from new and existing potlines; new emissions standards for polycyclic organic matter (POM) from new and existing prebake potlines and existing pitch storage tanks; reduce the emissions standards for POM from existing Soderberg potlines; eliminate the startup, shutdown and malfunction exemption; and make certain other technical and editorial changes.

NPRM: Sent to OMB for Regulatory Review10/14/2011
NPRM: Received by OMB10/17/2011
NPRM: Regulatory Review Concluded11/04/2011
NPRM: Published in FR12/06/2011
NPRM: Comment Period Extension Published in FR01/19/2012
NPRM: Comment Period Closed with Extension02/01/2012
Supplemental NPRM: Comment Period Open12/08/2014
Supplemental NPRM: Published in FR12/08/2014
Supplemental NPRM: Comment Period Closed01/22/2015
Final Rule: Published in FR08/2015 (projected)

Potential Effects

Environmental Justice
This rulemaking involves a topic that is likely to be of particular interest to or have particular impact upon minority, low-income, tribal, and/or other vulnerable populations because:

  • This topic is likely to result in the collection of information or data that could be used to assess potential impacts on the health or environmental conditions of vulnerable populations.

Federal Government - other agencies
Likely to be involved in the implementation of this rule.

Local Governments
Likely to be involved in the implementation of this rule.

State Governments
Likely to be involved in the implementation of this rule.

Participate / Learn More

Comment Period Open (12/08/2014 until 01/22/2015) - Click to access the document on Regulations.gov and comment by clicking "Submit Comment" near the top of the Regulations.gov page.

Regulatory Review

Some of EPA's rulemakings undergo regulatory review (What's this?), as prescribed by Executive Order 12866 and coordinated by the Office of Management and Budget (OMB). The following list describes which of this rulemaking's stages have completed review and published in the Federal Register, if any, and provides links to the review documents where available. Consult the "Timeline" section of this Web page for the dates of each review.

  • NPRM - This stage of the rulemaking underwent review.
  • Final Rule - No Information Available.
  • Final Rule - No Information Available.
  • Supplemental NPRM - This stage of the rulemaking did not undergo review.
Citations & Authorities

Federal Register Citations

Code of Federal Regulations (CFR) Citation
40 CFR 112

Legal Authority
42 USC 7412


This site provides summaries of priority rulemakings and priority retrospective reviews of existing regulations. We update most of the site at the beginning of each month, though some data is updated more frequently if it is time sensitive. The information on this site is not intended to and does not commit EPA to specific conclusions or actions. For example, after further analysis, EPA may decide the effects of a rule would be different or it may decide to terminate a rulemaking.

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