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Event Year: Date:

SUMMARY.pdf  The PM10 exceedance for 25 October had AQI values as high as 128. PM2.5 levels were elevated but only reached the Moderate AQI level. The primary contributing factor was the strong winds associated with the strong cold front that moved into the area from the NW US.
DES M Resort Visibility Camera.jpg  DES M Resort Visibility Camera pictures from 25 October at 0800, 1200, 1500, and 1800PST. Pictures are a view to the northwest from the top of the M Casino and depict an increase in dust throughout the day.
DES Air Quality Forecast.jpg  DES Air Quality Forecast valid from 23 to 27 October. The forecast called for the ozone AQI to be in the Good level for the period with Particulate Matter 10 and 2.5 in the Moderate range for 23 and 24 October. A major weather pattern change was expected over the weekend resulting in improve conditions but with regional and/or localized periods of blowing dust for late Sunday and Monday.
AirNow Daily AQIs.jpg  AirNow Daily AQIs depicts AQI areas for Ozone and Particulate Matter (PM2.5 and PM10) of Moderate and higher for October 25. The Ozone image depict no significant areas of Ozone over NV. However, the PM image depicts a small area of Unhealthy for Sensitive Groups over Las Vegas extending towards the northwest of the Vegas Valley.
AirNow AQI Animation.gif  AirNow AQI Animation valid from October 25/12:20 AM to 26/12:20 AM PDT. Animation depicts an AQI area of Moderate starts to develop over Southern NV at approximately 1:00AM in the morning through the rest of the day. By approximately 1:00PM an AQI area of Unhealthy for Sensitive Groups (USG) starts to develop in the Vegas Valley, extending to the NE of the Valley into the late evening hours.
DES Air Quality Index.jpg  DES Air Quality Index data valid for 25 October. The data shows the Air Quality Rating for each site in the DES network. On this day, 2 sites exceeded with the following reported AQI: Jerome Mack at 128 and Sunrise Acres at 105.
500MB.gif  500MB animation valid from October 24/06Z to 27/06Z in 6-hour increments. Data starts off depicting high pressure off the coast of CA with Troughing over NE NV. By 25/06Z, a strong Jet Max, with speeds in excess of 95 knots, pushes south bring those strong northerly winds over the CA/S NV/AZ area.
SFC.gif  SFC is an animation of the US surface analysis from October 24/00Z to 26/18Z. The animation depicts a strong frontal system over the NW US at 24/12Z which moves south towards the SW US through 26/18Z. The cold front moves over S NV by 25/18Z with strong winds at and behind the system.

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.