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EPA/OAR RIN: 2060-AR28 Publication ID: Spring 2024 
Title: Ozone and Fine Particulate Matter (PM2.5) Significant Impact Levels (SILs) for Prevention of Significant Deterioration (PSD) Program 
Abstract: This action may propose Significant Impact Levels (SILs) for ozone and PM2.5 to facilitate implementation of the Prevention of Significant Deterioration (PSD) program in areas attaining the national ambient air quality standards (NAAQS) for Ozone or PM2.5. The SILs for Ozone and PM2.5 could be used as compliance demonstration tools by permitting authorities to help determine whether the projected emissions from a proposed new major source or major modification will cause or contribute to a violation of the NAAQS. This proposed action is, in part, in response to the January 22, 2013, D.C. Circuit's decision that vacated the PM2.5 Significant Monitoring Concentration (SMC) and vacated and remanded two provisions in the EPA's PSD regulations containing SILs that were contained in the 2010 rule promulgating increments, SMCs, and SILs for PM2.5. The EPA issued guidance on SILs for PM2.5 and Ozone on April 17, 2018. Based on the information gathered from the implementation of this guidance by the permitting authorities, the EPA may complete a rulemaking action, as appropriate. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Long-Term Actions 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 51.156   
Legal Authority: 42 U.S.C. 7470-7479   
Legal Deadline:
Action Source Description Date
None       
Timetable:
Action Date FR Cite
NPRM  To Be Determined 
Additional Information: .
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Undetermined 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Information URL: https://www.epa.gov/nsr  
RIN Data Printed in the FR: No 
Agency Contact:
Rochelle Boyd
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code D-243-02,
Research Triangle Park, NC 27711
Phone:919 541-1390
Email: boyd.rochelle@epa.gov