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EPA/AR RIN: 2060-AP15 Publication ID: Fall 2008 
Title: ●Ambient Ozone Monitoring Regulations: Revisions to Network Design Requirements 
Abstract: Ozone monitoring requirements were revised in October 2006 during a comprehensive revision of ambient monitoring requirements contained in 40 CFR parts 50, 53, and 58. These changes included revised minimum monitoring requirements for ozone monitors in urban areas as well as changes to the length of the required monitoring season. As stated in the Ozone National Ambient Air Quality Standards (NAAQS) final rule published on March 27, 2008 (73 FR 16436), EPA believes that certain changes are needed in the ozone minimum monitoring requirements to account for the newly revised levels of the NAAQS (primary and secondary NAAQS levels for ozone were revised from an eight-hour level of 0.08 ppm to an eight-hour level of 0.075 ppm). In this rulemaking, EPA will propose: (1) modest changes to minimum monitoring requirements in urban areas, (2) minimal monitoring requirements in rural areas, and (3) incremental adjustments to the length of the ozone monitoring season where indicated by statistical analysis. These proposed actions have been developed in response to comments that were received from some States, national monitoring associations, and environmental groups during the Ozone NAAQS proposal that was published on July 11, 2007 (72 FR 37818). No changes will be proposed in ozone measurement methodology, quality assurance requirements, or probe siting requirements. Therefore, the implementation of any proposed changes should be routine for affected monitoring agencies. 
Agency: Environmental Protection Agency(EPA)  Priority: Other Significant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: Undetermined 
CFR Citation: 40 CFR 50   
Legal Authority: Clean Air Act   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  02/00/2009    
Final Action  11/00/2009    
Additional Information: SAN No. 5259
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:
Lewis Weinstock
Environmental Protection Agency
Air and Radiation
C304-06,
Research Triangle Park, NC 27711
Phone:919 541-3661
Fax:919 541-1903
Email: weinstock.lewis@epamail.epa.gov

Tim Hanley
Environmental Protection Agency
Air and Radiation
RTP, NC 27711
Phone:919 541-4417
Fax:919 541-1903
Email: hanley.tim@epamail.epa.gov