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Hayden | Lead Nonattainment Area

County Affected:

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

Nonattainment Area Designation Date:

Sept. 3, 2014
(79 FR 52205)

Pollutant of Concern:

Lead (2008 standard)


The concentration of lead in the air in Hayden is frequently above federal standards. ADEQ submitted a nonattainment State Implementation Plan (SIP) to EPA in March 2017. ASARCO is making numerous improvements to the Hayden smelter as part of a $180 million converter retrofit project that will dramatically reduce lead concentrations in 2018. Some of the controls implemented at the copper smelter include:

  • Ventilation hooding over furnaces
  • Baghouses for flash furnace and anode furnace
  • Paved road cleaning
  • Chemical dust suppressants for unpaved roads
  • Enclosed and ventilated storage of acid plant scrubber blowdown solids
  • Wind fences for byproduct storage

Source of Pollutant:

  • Copper smelter

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