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EPA/OAR RIN: 2060-AV52 Publication ID: Spring 2023 
Title: Reconsideration of the National Ambient Air Quality Standards for Particulate Matter 
Abstract: Under the Clean Air Act Amendments of 1977, EPA is required to review and if appropriate revise the air quality criteria and standards for the primary (health-based) and secondary (welfare-based) national ambient air quality standards (NAAQS) every 5 years. On December 18, 2020, the EPA published a final decision retaining the NAAQS for particulate matter (PM), which was the subject of several petitions for reconsideration as well as petitions for judicial review. As directed in Executive Order 13990, "Protecting Public Health and the Environment and Restoring Science to Tackle the Climate Crisis,” signed by President Biden on January 20, 2021, EPA is undertaking a reconsideration of the December 2020 decision to retain the PM NAAQS because the available scientific evidence and technical information indicate that the current standards may not be adequate to protect public health and welfare, as required by the Clean Air Act. As part of this reconsideration, EPA developed a Supplement to the 2019 PM Integrated Science Assessment (ISA) and a Policy Assessment to take into account the most up-to-date science on public health impacts of PM, and engaged with the chartered Clean Air Scientific Advisory Committee (CASAC) and a newly-constituted expert CASAC PM panel. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 50   
Legal Authority: 42 U.S.C. 7401 et seq, Clean Air Act   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  01/27/2023  88 FR 5558   
Final Rule  10/00/2023 
Additional Information: EPA-HQ-OAR-2015-0072.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Karen Wesson
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code C504-06,
Research Triangle Park, NC 27711
Phone:919 541-3515
Email: wesson.karen@epa.gov

Nicole Hagan
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code C504-06,
Research Triangle Park, NC 27709
Phone:919 541-3153
Email: hagan.nicole@epa.gov