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. The Fires, Asian, and Stratospheric Transport–Las Vegas Ozone Study (FAST-LVOS) was conducted in May and June of 2017 tostudy the transport of ozone (O3) to Clark County, Nevada, a marginalnon-attainment area in the southwestern United States (SWUS). This 6-week (20 May–30 June 2017) field campaign used lidar, ozonesonde, aircraft, andin situ measurements in conjunction with a variety of models to characterizethe distribution of O3 and related species above southern Nevada andneighboring California and to probe the influence of stratosphericintrusions and wildfires as well as local, regional, and Asian pollution on surfaceO3 concentrations in the Las Vegas Valley (≈ 900 m above sea level, a.s.l.). In this paper, we describe the FAST-LVOS campaign and presentcase studies illustrating the influence of different transport processes onbackground O3 in Clark County and southern Nevada. The companion paperby Zhang et al. (2020) describes the use of the AM4 and GEOS-Chem globalmodels to simulate the measurements and estimate the impacts of transportedO3 on surface air quality across the greater southwestern US andIntermountain West. The FAST-LVOS measurements found elevated O3 layers above Las Vegas on more than 75 % (35 of 45) of the sample days and show that entrainment of these layers contributed to mean 8 h average regionalbackground O3 concentrations of 50–55 parts per billion by volume(ppbv), or about 85–95 µg m−3. These high backgroundconcentrations constitute 70 %–80 % of the current US National Ambient Air Quality Standard (NAAQS) of 70 ppbv (≈ 120 µg m−3 at 900 m a.s.l.) for the daily maximum 8 h average (MDA8) and will make attainment of the more stringent standards of 60 or 65 ppbv currently being consideredextremely difficult in the interior SWUS.

The &lt;i&gt;Fires, Asian, and Stratospheric Transport&lt;/i&gt;–Las Vegas Ozone Study (&lt;i&gt;FAST&lt;/i&gt;-LVOS)

The <i>Fires, Asian, and Stratospheric Transport</i>–Las Vegas Ozone Study (<i>FAST</i>-LVOS)