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Hayden | Lead (Pb) 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 (Pb) in the air in the Hayden, Arizona Pb nonattainment area (NAA) is frequently above federal standards. ADEQ submitted a nonattainment State Implementation Plan (SIP) to U.S. Environmental Protection Agency (EPA) in March 2017 that was approved by EPA effective Dec. 14, 2018 | View Federal Register >

In 2018 ASARCO, a contributor to Pb emissions in the NAA, completed numerous improvements to the Hayden copper smelter as part of a $180 million converter retrofit project which will further reduce Pb concentrations in the NAA. 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

Effective March 2, 2022, EPA determined that the Hayden Pb NAA failed to attain the 2008 Pb primary and secondary national ambient air quality standards (NAAQS) by the applicable attainment date of Oct. 3, 2019 | View Federal Register >

As a result of this determination, the State of Arizona is required to submit by Jan. 31, 2023, revisions to the Arizona SIP that, among other elements, provide for expeditious attainment of the Pb NAAQS in the Hayden Pb NAA by Jan. 31, 2027.

Source of Pollutant:

  • Copper smelter

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