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EPA/AR RIN: 2060-AP15 Publication ID: Spring 2010 
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 8-hour level of 0.08 ppm to an 8-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: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Final Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 58 
Legal Authority: 42 USC 7403; 42 USC 7410; 42 USC 7601(a); 42 USC 7611; 42 USC 7619 
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  07/16/2009  74 FR 34525 
NPRM Comment Period End  09/14/2009   
Final Action  04/00/2010   
Additional Information: SAN No. 5259; EPA publication information: NPRM - http://www.epa.gov/fedrgstr/EPA-AIR/2009/July/Day-16/a16802.pdf; EPA Docket information: EPA-HQ-OAR-2008-0338.
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:
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

Lula Melton
Environmental Protection Agency
Air and Radiation
E143-02,
Research Triangle Park, NC 27711
Phone:919 541-2910
Fax:919 541-4511
Email: melton.lula@epa.gov

 
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