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Miami | Particulate Matter (PM-10) Nonattainment Area

Counties Affected:

Parts of Pinal and Gila Counties  | View on a Map >

Nonattainment Area Designation Date:

Oct. 31, 1990
(55 FR 45799)

Classification Level: 


Pollutant of Concern:

PM10 (particulate matter 10 microns or less in diameter; 1987 standards)


The concentration of PM10 in the air in the Miami PM10 nonattainment area (NAA) has been below federal standards or lacking complete data for several years. ADEQ is developing a redesignation request so that EPA will reclassify the area as an attainment area. As part of this request, ADEQ must include an updated emissions inventory, modeling demonstration and a strategy for Exceptional Events. Freeport-McMoran made numerous improvements to the Miami smelter as part of a $250 million expansion project that will further reduce PM10 concentrations. Some of the controls implemented at the copper smelter include:

  • Baghouses for materials storage bins
  • Baghouse for anode furnace
  • Wet electrostatic precipitator for furnace
  • Ventilation system over furnace
  • Water suppression for material piles and unpaved roads
  • Paved road cleaning

Sources of Pollutant:

  • Manufacturing of metal
  • Open burning and wildfires
  • Windblown dust

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