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EPA/AR RIN: 2060-AI43 Publication ID: Spring 2011 
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 carbon monoxide (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: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: Undetermined  Unfunded Mandates: No 
CFR Citation: 40 CFR 50   
Legal Authority: 42 USC 7408 and 7409   
Legal Deadline:
Action Source Description Date
Final  Judicial  US District Court Northern District of CA San Francisco Division 5/5/08  08/12/2011 
NPRM  Judicial  US District Court Northern District of CA San Francisco Division 5/5/08  01/28/2011 
Timetable:
Action Date FR Cite
NPRM  02/11/2011  76 FR 8158   
NPRM Comment Period End  04/12/2011    
Final Action  08/00/2011    
Additional Information: EPA publication information: NPRM - http://www.regulations.gov/#!documentDetail; 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: http://www.epa.gov/ttn/naaqs/standards/co/s_co_index.html  
RIN Data Printed in the FR: No 
Agency Contact:
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

Karen Martin
Environmental Protection Agency
Air and Radiation
C504-06,
Research Triangle Park, NC 27711
Phone:919 541-5274
Fax:919 541-0237
Email: Martin.Karen@epamail.epa.gov