County Affected:

Parts of Pinal County | View on a Map >

Nonattainment Area Designation Date:

Oct. 31, 1990

Learn more about the designation of the area in the Federal Register (FR) (55 FR 45799) | View >

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 Hayden is occasionally above the federal limit established in the federal National Ambient Air Quality Standards (NAAQS). Currently, ADEQ is developing a State Implementation Plan (SIP) revision to determine the control measures that are feasible and will help the area attain the NAAQS. The Clean Air Act requires that ADEQ include an updated emissions inventory, a modeled attainment demonstration and a strategy for possible exceptional events demonstrations in the SIP. ADEQ will be working with permitted facilities, local government, and community stakeholders in a collaborative effort to develop the SIP. 

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