The Department of Environmental Quality will hold a public hearing on proposed amendments to R18-2-101 through R18-2-216 regarding ambient air quality. The amendments would update the ambient air quality standards for particulate matter with an aerodynamic diameter of less than or equal to 2.5 microns, and eight-hour averaged ozone to conform to the most recent federal NAAQS. The hearing will be January 20, 2009. http://www.azsos.gov/public_services/Register/2008/51/proposed.pdf pp. 4593-620.