Miami, Arizona, is a historic copper mining town in Gila County, 80 miles southeast of Phoenix and 112
miles northeast of Tucson. Miami’s sister city, Globe, lies four miles to the east. The Hayden/Miami
Nonattainment Area was designated for nonattainment of the particulate matter National Ambient Air
Quality Standard by operation of law following the Clean Air Act amendments of 1990. In March, 2007, EPA approved a boundary redesignation of the Hayden/Miami PM10 nonattainment area into two separate, but adjoining, PM10 nonattainment areas. Together, these two new PM10 nonattainment areas cover the same geographic area as the original Hayden/Miami PM10 nonattainment area. This plan demonstrates that all CAA requirements for attainment and maintenance have been met and summarizes the progress of the area in attaining the PM10 standard. This plan also summarizes and demonstrates that the MNA qualified for EPA’s Clean Data Policy and the Limited Maintenance Plan option.

This document is an attainment demonstration, maintenance plan, and formal request to the United States Environmental Agency to redesignate the Miami, Arizona area, a nonattainnlent area for sulfur dioxide (SO,), to attainment for the health-based 24-hour average and annual average SO, National Ambient Air Quality Standards. It summarizes the progress ofthe area in attaining the SO, standards, demonstrates that all Clean Air Act requirements for attainment have been adopted, and includes a maintenance plan to assure continued attainment after redesignation. This document also demonstrates that the emission reduction control measures responsible for the air quality improvement are both permanent and enforceable.