On Wednesday, Dec. 26, 2017, the public comment period began for the proposal to revise the Arizona State Implementation Plan (SIP). The revision includes a request that EPA redesignate the Ajo nonattainment area to attainment for the PM₁₀ National Ambient Air Quality Standards. It also includes a request that EPA remove the outdated total suspended particulates (TSP) nonattainment designation for the Ajo area.

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Comments may be submitted as follows:
     Email | Send Email > 
     Mail: (Must be postmarked or received by Jan. 24, 2019)

      ADEQ
      Bruce Friedl
      Air Quality Division, Air Quality Improvement Planning Section
      1110 W. Washington Street
      Phoenix, AZ  85007