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EPA/AR RIN: 2060-AO24 Publication ID: Fall 2010 
Title: Prevention of Significant Deterioration for PM2.5—Increments, Significant Impact Levels, and Significant Monitoring Concentrations 
Abstract: EPA is finalizing regulations under the Prevention of Significant Deterioration (PSD) program to establish new increments, significant impact levels (SILs) and a significant monitoring concentration (SMC) for fine particulate matter (particles with an aerometric diameter less than or equal to a nominal 2.5 micrometers, “PM2.5”). These regulations are consistent with section 166 of the Clean Air Act which authorizes the Environmental Protection Agency to establish regulations to prevent significant deterioration of air quality due to emissions of any pollutant for which National Ambient Air Quality Standards (NAAQS) have been promulgated. The NAAQS for PM2.5 were promulgated in 1997. To help facilitate the states’ implementation of the preconstruction review permit process, this action will also establish screening tools (SILs and SMC) to determine when sources must complete analyses to satisfy specific requirements associated with the evaluation of PM2.5 impacts. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Completed Actions 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 52.21    40 CFR 51.166   
Legal Authority: 42 USC 7410    42 USC 7470-7479    42 USC 7501-7503    42 USC 7601(a)(1)   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  09/21/2007  72 FR 54112   
Notice of Extension of Comments  11/20/2007  72 FR 65282   
NPRM Comment Period End  01/08/2008    
Final Action  10/20/2010  75 FR 64864   
Additional Information: EPA publication information: NPRM - http://www.regulations.gov/search/Regs/home.html#documentDetail?R=090000648029651b; EPA Docket information: EPA-HQ-OAR-2006-0605
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal, Local, State, Tribal 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Information URL: http://www.epa.gov/nsr/  
RIN Data Printed in the FR: No 
Agency Contact:
Dan DeRoeck
Environmental Protection Agency
Air and Radiation
C504-02,
Research Triangle Park, NC 27711
Phone:919 541-5593
Fax:919 541-5509
Email: deroeck.dan@epamail.epa.gov

Chuck Buckler
Environmental Protection Agency
Air and Radiation
C504-03,
Research Triangle Park, NC 27711
Phone:919 541-0873
Fax:919 541-5509
Email: buckler.charles@epa.gov