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EPA/AR RIN: 2060-AO11 Publication ID: Spring 2009 
Title: Air Quality Index Reporting and Significant Harm Level for PM2.5 
Abstract: EPA's Air Quality Index (AQI) is used by States for daily air quality reporting to the general public in accordance with section 319 of the Clean Air Act (Act). The AQI must be updated whenever EPA revises one of the National Ambient Air Quality Standards (NAAQS). In 2006, EPA revised the NAAQS for fine particulates. The purpose of this rulemaking is to make revisions to the AQI for fine particulates to be consistent with the revised NAAQS. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 58.50    40 CFR 58 appendix G    40 CFR 51.150 subpart H   
Legal Authority: 42 USC 7401 et seq   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  07/00/2009    
Final Action  12/00/2009    
Additional Information: SAN No. 5115; EPA Docket information: EPA-HQ-OAR-2007-0195
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 Data Printed in the FR: No 
Agency Contact:
Susan Stone
Environmental Protection Agency
Air and Radiation
C504-06,
Research Triangle Park, NC 27711
Phone:919 541-1146
Fax:919 541-0237
Email: stone.susan@epa.gov

Phil Lorang
Environmental Protection Agency
Air and Radiation
C304-04,
Research Triangle Park, NC 27711
Phone:919 541-5463
Email: lorang.phil@epa.gov