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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 109 T.W. Alexander Drive, Mail Code E143-02, Research Triangle Park, NC 27711 Phone:919 541-2910 Fax:919 541-4511 Email: melton.lula@epa.gov