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 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 periodically evaluate those standards and revise them as needed. In 1997, EPA completed an analysis of the 1-hour ozone standard and adopted a new more stringent 8-hour standard, which better protects the public from longer periods of exposure to ozone. (For more information see the EPA Web site Leaving ADEQ Web site.)

The ADEQ Air Quality Division worked with stakeholders to develop a recommendation for designating areas of the state that do or do not meet the new standard. On July 15, 2003, the Governor sent recommendations to EPA that all areas of the state, except the Phoenix area in eastern Maricopa County, be designated as attainment/unclassifiable for the 8-hour ozone standard. On April 15, 2004, EPA issued final area designations. The Phoenix 8-hour ozone nonattainment area includes much of eastern Maricopa County and Apache Junction in Pinal County.

As part of the process of implementing the new standard, EPA released the first part of the 8-hour ozone implementation rule. The Phase 1 rule outlines the steps areas should take to meet the new 8-hour standard, including the development of a State Implementation Plan (SIP) revision that details the control strategies necessary to ensure attainment. The rule requires that a SIP for the Phoenix nonattainment area be submitted to EPA by 2007 and that the area meet the new standard by 2009.

The time line below highlights some of the significant past and future events in the 8-hour ozone standard implementation process. Information on Arizona's 8-hour ozone area recommendations, EPA's response and final designations, the implementation rule, as well as meetings and workshops hosted by ADEQ are also provided below. If you have questions or comments, please send them to Bruce Friedl.

Final 8-hour Ozone Area Designation

Technical Analysis In Support of Arizona's 8-hour Ozone Area Designation Recommendations

Additional Information

Disclaimer/Privacy Statement | Feedback Leaving ADEQ Web site | Web Site Services | Last Revision Mar. 05, 2007
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.