In October 2009, the U.S. Environmental Protection Agency (EPA) asked the Governor to submit a recommendation designating areas of Pinal County as being either attainment, nonattainment or unclassifiable (inadequate data to make a determination) for the inhalable Particulate Patter (PM10) and fine Particulate Matter (PM2.5) National Ambient Air Quality Standards (NAAQS). U.S. EPA's request is based on PM10 and PM2.5 concentrations measured in the western portion of the County that are in violation of the NAAQS.
ADEQ's recommendation to the Governor followed careful consideration of the 1987 24-hour PM10 and 1997 Annual PM2.5 standards, requirements for designation of nonattainment areas, and options available for implementing the standards. For more information please visit U.S. EPA: Particulate Matter
The following information for the Pinal County PM2.5 and PM10 Boundary Designations are available for review:
Public Safety and Particulate Matter
At the direction of Governor Brewer, ADEQ will collaborate with the Arizona State Land Department, the Arizona Department of Transportation, and the Arizona Department of Public Safety to assess risks posed by windblown dust in Pinal County. Check back often; developments in this process will be posted as they occur.
Additional Information on Particulate Matter:
Archived documents available upon request.
For more information, please contact Lisa Tomczak - (602) 771-4450.