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Event Year: Date:

DES Air Quality Forecast.jpg  DES Air Quality Forecasts issued on 2 and 3 June valid from 2 June through 7 June. Forecasts called for an AQI in the Unhealthy for Sensitive Groups between 2-4 June for Ozone. Otherwise, the Ozone AQI was forecasted to be Moderate.
AirNow Daily AQIs.jpg  AirNow Daily AQIs for 2 June through 4 June which depicts both the Ozone and Particulate Matter (PM10 and PM2.5 combined) AQIs over the SW US. Areas of concern are the ones shaded orange over Las Vegas which depict the Unhealthy for Sensitive Groups AQI level. Otherwise, there were no significant PM areas in Nevada.
DES Seasonal Ozone Advisory.pdf  The Seasonal Ozone Advisory issued by DES covering the period April through September, when ozone exceedances are expected to occur.
DES Air Quality Index.jpg  DES daily AQI data valid for 2 through 4 June show the sites exceeding the ozone NAAQS in orange. All exceeding sites were in the Greater Las Vegas valley.
AirNow Hysplit.jpg  Hysplit trajectory plots for June 2-4 with 24-hour trajectories ending near the time of the maximum ozone levels. Each day shows airflow entering the Las Vegas valley from Southern California, with small travel distances in the last six hours.
500MB.gif  500MB animation valid from June 1/06Z to 6/06Z in 6-hour increments. Data depicts the Pacific High moving over CA/NV from 1 June through 4 June on its way towards NW AZ. By 4 June, an upper level disturbance moves over N CA as it pushes through N NV.
Summary.pdf  The combination of weather favoring high levels of ozone and southerly flow transporting ozone producing pollutants from S CA into S NV resulted in the Ozone exceedances from June 2 through June 4 over the Las Vegas Valley.
SFC.gif  SFC animation valid from June 1/06Z to 6/06Z in 6-hour increments. Animation shows the surface pattern under a strong upper level High or Ridge dominating the SW US. Weather associated with this pattern are Thermal Low(s), which can be seen over the CA/NV/AZ boundaries, and the weak gradient associated with light, variable winds.

PLEASE NOTE: This data has not been verified by the Clark County Department of Air Quality and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from Clark County Department of Air Quality ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.