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 It also includes a request that EPA remove the outdated total suspended particulates (TSP) nonattainment designation for the Ajo area.
Comments may be submitted as follows:
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Mail: (Must be postmarked or received by Jan. 24, 2019)
Air Quality Division, Air Quality Improvement Planning Section
1110 W. Washington Street
Phoenix, AZ 85007