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West Pinal | PM-10 Nonattainment Area

County Affected:

Parts of Pinal County | View on a Map >

Nonattainment Area Designation Date:

May 31, 2012
(77 FR 32024)

Classification Level: 


Pollutant of Concern:

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


The concentration of PM10 in the air in West Pinal County is frequently above federal standards. ADEQ submitted a nonattainment Plan to EPA in December 2015. Controls in the plan include:

  • Agricultural Best Management Practices (such as combining tractor operations or reducing tillage)
  • Water/chemical dust suppressants on open areas/vacant lots
  • Watering for dust-generating construction operations
  • Vehicle speed limits
  • Road dust trackout controls

In June 2016 the Governor of Arizona certified the Maricopa Association of Governments (MAG) as the lead planning organization for the West Pinal PM10 Nonattainment Area. MAG will develop future air quality plans for these areas in cooperation with the Sun Corridor Metropolitan Planning Organization and ADEQ.

On June 24, 2020, EPA published a final rule to determine that the West Pinal County Nonattainment Area has failed to meet the PM10 standard by the Dec. 31, 2018, attainment date and is reclassified as a Serious Area. The effective date was July 24, 2020. Serious Area Plan is due within 18 months of the reclassification date, which is Jan. 24, 2022.

On January 8, 2021, EPA proposed to approve in part and to disapprove in part the SIP revision submitted by the State of Arizona to meet Clean Air Act requirements for the 1987 PM10 national ambient air quality standards in the West Pinal County PM10 nonattainment area. EPA proposed to approve the base year 2008 emissions inventory for direct PM10 and to disapprove the remaining elements of the West Pinal County PM10 Plan.

Sources of Pollutant:

  • Unpaved roads
  • Paved roads
  • Construction
  • Windblown dust
  • Agricultural activities

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