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West Pinal | Particulate Matter (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 the West Pinal County PM10 nonattainment area (NAA) is frequently above federal standards. ADEQ submitted a nonattainment state implementation plan (SIP) revision to the U.S. Environmental Protection Agency (EPA) in December 2015. Controls in the plan revision 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 NAA. 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 NAA has failed to meet the 1987 PM10 National Ambient Air Quality Standards (NAAQS) by the Dec. 31, 2018, attainment date and reclassified the NAA from a Moderate to a Serious Area | View Federal Register >

The effective date was July 24, 2020. A Serious Area plan is due within 18 months of the reclassification date, which is Jan. 24, 2022.

On Jan. 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 NAAQS in the West Pinal County PM10 NAA | View Federal Register >

EPA proposed to approve the base year 2008 emissions inventory for direct PM10 and to disapprove the remaining elements of the plan.

Sources of Pollutant:

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

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