The Environmental Protection Agency (EPA) is proposing to approve revisions to the Arizona State Implementation Plan (SIP). These revisions include a state statute and certain state rules that govern air pollution sources under the Arizona Department of Environmental Quality (ADEQ) and the Pinal County Air Quality Control District (PCAQCD). These revisions concern emissions of particulate matter (PM) from construction sites, agricultural activity and other fugitive dust sources. We are proposing to approve local rules to regulate these emission sources under the Clean Air Act (CAA or the Act). We are taking comments on this proposal and plan to follow with a final action.