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EPA/AR RIN: 2060-AO02 Publication ID: Spring 2008 
Title: Prevention of Significant Deterioration: Refinement To Increment Modeling Procedures 
Abstract: Part C of title I of the Clean Air Act (CAA) contains the requirements for a component of the major New Source Review (NSR) program known as the Prevention of Significant Deterioration (PSD) program. This program sets forth procedures for the preconstruction review and permitting of new and modified major stationary sources of air pollution locating in areas meeting the National Ambient Air Quality Standards (NAAQS), i.e., "attainment" areas, or in areas for which there is insufficient information to classify an area as either attainment or nonattainment, i.e., "unclassifiable" areas. The applicability of the PSD program to a particular source must be determined in advance of construction and is pollutant-specific. The PSD program also established increments, which are maximum increases in ambient air concentrations allowed in a PSD area over a baseline concentration. These increments follow the three-tiered area classification system established by Congress in Section 163 of the CAA. Class I areas include certain national parks and wilderness areas that were designated by Congress as areas of special national concern, where the need to prevent air quality deterioration is the greatest. Class II areas are all areas not specifically designated in the CAA as Class I areas, and Class III areas are the ones originally designated as Class II, where higher levels of industrial development (and emission growth) are desired. In this rulemaking, we will finalize refinements to several aspects of the method that may be used to calculate an increase in concentration for increment purposes. These refinements are intended to clarify how States and regulated sources may calculate increases in concentration for purposes of determining compliance with the PSD increments. 
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 51   
Legal Authority: CAATitle I, Part C   
Legal Deadline:  None
Action Date FR Cite
NPRM  06/06/2007  72 FR 31372   
Final Action  10/00/2008    
Additional Information: SAN No. 5100; EPA publication information: NPRM -; EPA Docket information: EPA-HQ-OAR-2006-0888
Regulatory Flexibility Analysis Required: No  Government Levels Affected: State, Tribal 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Jessica Montanez
Environmental Protection Agency
Air and Radiation
Research Triangle Park, NC 27711
Phone:919 541-3407
Fax:919 541-5509

Dan Deroek
Environmental Protection Agency
Air and Radiation
RTP, NC 27711
Phone:919 541-5593
Fax:919 541-5509