Counties Affected:

Parts of Pinal and Gila Counties | 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 the Miami Nonattainment Area is currently below the federal limit established by the federal National Ambient Air Quality Standards (NAAQS). ADEQ will develop and submit a redesignation request to EPA in order to start the process of reclassifying the area as an attainment area. As part of this request, ADEQ must include an updated emissions inventory, modeled attainment  demonstration, and a strategy for possible exceptional events demonstrations. ADEQ will be working with permitted facilities, local government, and community stakeholders in a collaborative effort to develop the SIP. 

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