On December 22, 2017, the U.S. Environmental Protection Agency (EPA) announced its intent to designate the Las Vegas urbanized area of Clark County, Nevada, as nonattainment for the 2015 National Ambient Air Quality Standards (NAAQS) for ozone. This announcement was issued in response to the State of Nevada's September 2016 recommendations that this area of Clark County be designated as nonattainment for the 2015 ozone NAAQS. EPA intends to designate not only these three HAs but also a portion of HA 216 as nonattainment. EPA agreed with the State of Nevada's recommendation that all other areas in Nevada be designated as attainment/unclassifiable.

The State of Nevada has until February 28, 2018, to provide EPA with more current air quality data or any other additional information for consideration in determining the final ozone NAAQS nonattainment area boundaries. EPA intends to complete the 2015 ozone NAAQS designation process by April 30, 2018. Further details are available on the EPA ozone designations website. For any additional questions, please contact Emily McKeon or (510) 285-6351.