The Utah Department of Environmental Quality is proposing to amend R307-302-3 to reflect U.S. EPA changes to the NAAQS for PM2.5. The proposed amendment triggers a no-burn period when the Utah Division of Air Quality forecasts an exceedance of the NAAQS. http://www.rules.utah.gov/publicat/bull_pdf/2008/b20080601.pdf pp. 91-93.