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EPA/AR RIN: 2060-AI43 Publication ID: Spring 2010 
Title: Review of the National Ambient Air Quality Standards for Carbon Monoxide 
Abstract: Under the Clean Air Act, EPA is required to review and, if appropriate, revise the air quality criteria for the primary (health-based) and secondary (welfare-based) national ambient air quality standards (NAAQS) every 5 years. The last CO NAAQS review occurred in 1994 with a decision by the Administrator not to revise the existing standards. The current review, which initiated in September 2007, includes the preparation of an Integrated Science Assessment, Risk/Exposure Assessment, and a Policy Assessment Document by EPA, with opportunities for review by EPA's Clean Air Scientific Advisory Committee and the public. These documents inform the Administrator's decision as to whether to retain or revise the standards. 
Agency: Environmental Protection Agency(EPA)  Priority: Economically Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: Yes  Unfunded Mandates: No 
CFR Citation: 40 CFR 50   
Legal Authority: 42 USC 7408    42 USC 7409   
Legal Deadline:
Action Source Description Date
NPRM  Judicial  US District Court Northern District of CA, San Francisco Division 5/5/08.  10/28/2010 
Final  Judicial  US District Court Northern District of CA, San Francisco Division 5/5/08.  05/13/2011 
Timetable:
Action Date FR Cite
NPRM  11/00/2010    
Final Action  05/00/2011    
Additional Information: SAN No. 4266; EPA Docket information: EPA-HQ-OAR-2008-0015.
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: www.epa.gov/ttn/naaqs/standards/co/s_co_index.html  
RIN Data Printed in the FR: No 
Agency Contact:
Ines Pagan
Environmental Protection Agency
Air and Radiation
C504-06,
RTP, NC 27711
Phone:919 541-5469
Email: pagan.ines@epa.gov

Deirdre Murphy
Environmental Protection Agency
Air and Radiation
C539-02,
Research Triangle Park, NC 27709
Phone:919 541-0729
Fax:919 541-0840
Email: murphy.deirdre@epa.gov