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EPA/AR RIN: 2060-AI43 Publication ID: Fall 2007 
Title: Review of the National Ambient Air Quality Standards for Carbon Monoxide 
Abstract: Review of the national ambient air quality standards (NAAQS) for carbon monoxide (CO) every 5 years is mandated by the Clean Air Act. This review assesses the available scientific data about the health and environmental effects of CO and translates the science into terms that can be used in making recommendations about whether or how the standards should be changed. The last review of the CO NAAQS was completed in 1994 with a final decision that revisions were not appropriate at that time. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Long-Term Actions 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 50   
Legal Authority: 42 USC 7409   
Legal Deadline:
Action Source Description Date
Final  Statutory  -  08/01/1999 
Timetable:
Action Date FR Cite
NPRM  04/00/2012    
Final Action  12/00/2012    
Additional Information: SAN No. 4266;
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Undetermined 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Dave Mckee
Environmental Protection Agency
Air and Radiation
C504-06,
Research Triangle Park, NC 27711
Phone:919 541-5288
Fax:919 541-0237
Email: Mckee.Dave@epamail.epa.gov

Harvey Richmond
Environmental Protection Agency
Air and Radiation
C504-06,
Washington, DC 20460
Phone:919 541-5271
Email: Richmond.Harvey@epa.gov