Payson Moderate Area PM10 Maintenance Plan and Request for Redesignation to Attainment

The Clean Air Act states that an area can be redesignated to attainment if specific conditions are met, such as attainment of federal air quality standards; approval of a state implementation plan and a maintenance plan; and permanent and enforceable improvements in air quality. This document demonstrates that all CAA requirements for attainment have been met, summarizes the progress of the area in attaining the PM10 standards, demonstrates that the Payson area qualifies for EPA’s Clean Data Policy and Limited Maintenance Plan option, and includes a maintenance plan to assure continued attainment for ten years after the redesignation. This document is a formal request to the U.S. Environmental Protection Agency to redesignate the Payson, Arizona PM10 nonattainment area to attainment of the health-based 24-hour average and annual average PM10 National Ambient Air Quality Standards.

Analyses included in this document show that ambient air quality measurements have remained below the NAAQS for PM10, and both the 24-hour average design value and annual average PM10 design value are below EPA allowable limits. This document also demonstrates that the emission reduction control measures responsible for the air quality improvement are both permanent and enforceable.