COMMENT PERIOD ENDS | Proposed Redesignation Request and Maintenance Plan for PM-10 in Ajo, Ariz.

On Thursday, Jan. 24, 2019, the public comment period ends 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 It also includes a request that EPA remove the outdated total suspended particulates (TSP) nonattainment designation for the Ajo area. The public comment period began Dec. 26, 2018.

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