ADEQ: Air Quality Plans: 8-Hour Ozone

The U.S. EPA is charged with developing air quality standards for the protection of human health and welfare. EPA is also required to evaluate those standards periodically and revise them as needed (for general information on ozone see the EPA Web site

). In 1997, EPA completed an analysis of the 1-hour ozone standard, and adopted a new, more protective 8-hour standard to address the impacts of exposure of the public to longer periods of elevated ozone pollution. On June 13, 2007, ADEQ adopted and submitted to EPA, under the 1997 8-hour ozone standard, the Eight Hour Ozone Plan for the Maricopa Nonattainment Area

. This plan, developed by the Maricopa Association of Governments (MAG), demonstrated attainment of the 1997 8-hour ozone standard and attainment with that standard has been achieved. Because the nonattainment area is now in attainment, MAG developed the Draft 8-Hour Ozone Redesignation Request and Maintenance Plan for the Maricopa Nonattainment Area

adopted by ADEQ and submitted to EPA on March 25, 2009.

In 2008, EPA again revised the ozone standard and lowered the previous 8-hour standard from 0.08 parts per million (ppm) to 0.075 ppm . EPA has provided nine factors that states must consider when recommending boundaries for attainment, nonattainment, and unclassifiable areas. The major factors include consideration of sources of ozone precursor emissions, meteorological conditions, jurisdictional boundaries, and monitors currently measuring ozone at nonattainment levels. ADEQ developed a Technical Support Document (TSD) to explain to EPA the recommendations of the Governor for revising the boundaries of the ozone nonattainment area to address the new 2008 standard. The Governor's recommendations were submitted to EPA Region 9 in March 2009 and are posted, along with the TSD, below.

Technical Analysis for 8-Hour Ozone Boundary Designation (submitted in 2009 based on new 2008 Standard)

8-Hour Ozone Public Meeting on New 8-Hour Ozone Nonattainment Area Boundary, Feb. 12, 2009; Meeting Notice and Agenda
Information on Ozone Monitoring Sites and Air Quality Data Contained in ADEQ's 2008 Air Quality Report
Map of Major Features Related to 8-Hour Ozone Designation
Map of Ozone Monitoring Sites in Arizona
State Area Designations Under the Revised 8-Hour Average Ozone Standard (Powerpoint Presentation)
Timeline for Implementation of the New 8-Hour Ozone Standard
New! Arizona's 8-Hour Ozone Area Designation Recommendations
New! Final Recommendation Report for 2008 Ozone Standard
New! Comments Received on 8-Hour Ozone Area Designation Recommendations
New! Summary of Comments Received and ADEQ's Responses
New! EPA Region IX Recommendation and Response (EPA response pending)

Technical Analysis for 8-Hour Ozone Area Boundary Designation (submitted in 2003 based on old 1997 Standard)

Arizona Air Quality Designations, Boundary Recommendations for the 8-Hour Ozone National Air Quality Standard (Report) -- Appendices to the Report available upon request
Director's Letter to EPA
EPA's Final Designations for 1997 Standard

If you have any questions or comments, please send them to Bruce Friedl.

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Any ADEQ translation or communication is unofficial and not binding on the State of Arizona.
Cualquier traducción o comunicación de ADEQ no es oficial y no sujetará a ninguna responsabilidad legal al estado de Arizona.