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Nogales | Particulate Matter (PM-2.5) Nonattainment Area

County Affected:

Parts of Santa Cruz County | View on a Map >

Nonattainment Area Designation Date:

Nov. 13, 2009
(74 FR 58688)

Classification Level: 


Pollutant of Concern:

PM2.5 (particulate matter 2.5 microns or less in diameter; 2006 standard)


The concentration of PM2.5 in the air in the Nogales, Arizona, PM2.5 nonattainment area (NAA) has been below federal standards for several years. On April 13, 2021, ADEQ submitted a Maintenance Plan and Redesignation Request for the Nogales PM2.5 NAA to the U.S. Environmental Protection Agency (EPA). The maintenance plan summarizes the progress of the Nogales planning area in attaining the PM2.5 National Ambient Air Quality Standards (NAAQS) and demonstrates that all Clean Air Act requirements for redesignation to attainment have been satisfied. The clean air quality record, enforceable control measures, and projections of future emissions all show that the area will continue to maintain the 2012 24-hour PM2.5 NAAQS through 2032.

On March 2, 2022, EPA proposed to approve ADEQ’s Maintenance Plan and Redesignation Request for the Nogales PM2.5 NAA as a revision to the state implementation plan (SIP) | View Federal Register >

EPA also proposed to approve the State of Arizona's request to redesignate the Nogales area from nonattainment to attainment for the 24-hour PM2.5 NAAQS.

Sources of Pollutant:

  • On-road mobile (VOCs and NOx)
  • Non-point sources (VOCs)
  • Emissions from across the border

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