County Affected:

Parts of Santa Cruz County | View on a Map >

Nonattainment Area Designation Date:

Oct. 31, 1990
(55 FR 45799)

Classification Level: 

Moderate

Pollutant of Concern:

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

Summary: 

The concentration of PM₁₀ in the air in Nogales is occasionally above federal standards. ADEQ submitted a nonattainment State Implementation Plan (SIP) to EPA in 2012. EPA approved the plan in 2012 (77 FR 58962). The plan demonstrated that the Nogales area would attain the PM₁₀ standards, if not for emissions from across the border. Such controls included in the plan are:

• Chemical or water suppressants on materials piles
• Pave public roads
• Pave commercial parking lots
• Curbing on paved roads

Sources of Pollutant:

• Unpaved roads
• Construction
• Emissions coming over the border 

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