Clark County approved submission of the second 10‑year maintenance plan for the 1987 PM10 National Ambient Air Quality Standard (PM10) to the Nevada Department of Environmental Protection and the U.S. Environmental Protection Agency at a public hearing Aug. 5.

Ted Lehi, planning manager with the Clark County Department of Environment and Sustainability, described the State Implementation Plan (SIP) requirement under the Clean Air Act for areas that have previously been designated nonattainment. Lehi said the Las Vegas Valley was designated nonattainment for the 1987 PM10 standard in 1993, later achieved attainment in 2010, and submitted its first redesignation and first maintenance plan in 2012 (approved by EPA in 2014). The plan before the board is the second 10‑year maintenance plan and is intended to show how the valley will continue to meet the PM10 standard through the federal maintenance period.

A commissioner asked whether the area has shown progress since the plan’s original adoption; Lehi said the county has met the standard for well over a decade and that the current plan shows how the area will maintain compliance to a future year referenced in the plan (presenters cited a future maintenance year of 02/1935 in testimony). No members of the public spoke on the item during the hearing.

A motion to approve the plan’s submission was made and the board voted to approve it. Staff said the submission completes Clark County’s SIP obligations for the 1987 PM10 standard.