Of the four air quality agencies that operate in Arizona, two agencies, Arizona Department of Environmental Quality (ADEQ) and Maricopa County Air Quality Department (MCAQD), have proposed updates to their air quality permitting rules. The air quality permitting rule updates for both agencies are expected to be finalized in December 2015.
After many years of working on their new air quality permitting program and addressing various comments from USEPA and others, the new air quality permitting rules for the ADEQ are expected to go into effect on December 2, 2015 (i.e., 30 days after publication of the USEPA's final limited approval and disapproval of the ADEQ's program). This will mark the effective date of the "registration program" which is the new authorization mechanism that the ADEQ has added to its roster of air quality authorization options.
MCAQD had also hoped to obtain approval for its new air permitting program from the Maricopa County Board of Supervisors on December 9, 2015 (making the new rules locally enforceable and available for use in the county). However, MCAQD received comments on the last day of the public comment period that may cause it to rework some of the current proposals in the new rules. This has the potential to push the effective date of the new MCAQD rules package to a later date.