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EPA/AR RIN: 2060-AQ30 Publication ID: Fall 2010 
Title: ●Remaining Air Quality Designations for the 2006 24-Hour Fine Particle National Ambient Air Quality Standards 
Abstract: On November 13, 2009, EPA designated 31 areas across the country as nonattainment for the 24-hour PM2.5 NAAQS. These air quality designations were based on 2005-2007 data and analyses, with EPA taking into consideration 2006-2008 air quality monitoring data. EPA’s evaluation of 2006-2008 air quality monitoring data indicated that monitors in three areas which had not violated the 2006 24-hour PM2.5 NAAQS based on 2005-2007 data were now violating the standards based on 2006-2008 data. These monitors are located in Pinal County, AZ (2006-2008 24-hour design value of 48); Plumas County, CA (2006-2008 24-hour design value of 49); and, Shasta County, CA (2006-2008 24-hour design value of 48). For the three newly violating areas, EPA did not finalize initial designations. Because these areas are newly violating the 2006 24-hour PM2.5 NAAQS, EPA and the states and tribes in these areas needed further information in order to determine the appropriate nonattainment area boundaries for these areas, in accordance with the process that EPA has used for other nonattainment area designations, per section 107(d). In this final action, EPA will complete air quality designations for these three areas, and by doing so, for the 2006 24-hour PM2.5 NAAQS. 
Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 81   
Legal Authority: sec 107(d) of the CAA   
Legal Deadline:  None
Timetable:
Action Date FR Cite
Final Action  12/00/2010    
Additional Information: Split from RIN 2060-AP27. Regional Offices play a significant role in the designations process; EPA Docket information: EPA-HQ-OAR-2007-0562
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Wei-An Chang
Environmental Protection Agency
Air and Radiation
1200 Pennsylvania Avenue NW,
Washington, DC 20460
Phone:202 564-6658
Email: chang.andy@epa.gov

Carla Oldham
Environmental Protection Agency
Air and Radiation
109 T.W. Alexander Drive, Mail Code C539-04,
Research Triangle Park, NC 27711
Phone:919 541-3347
Fax:919 541-0824
Email: oldham.carla@epamail.epa.gov