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Event Year: Date:

AirNow Daily AQIs.jpg  Four graphical map images of daily ozone and PM10 AQI levels occurring in the southwestern US on June 27 and 28. Note the yellow Moderate areas in Southern Nevada with a small area in orange of PM10 AQI USG level in Las Vegas.
DES Air Quality Dust Advisory.pdf  The Dust Advisory issued by DES for Sunday, June 28, the day of the exceedance. It included "...the possiblity of blowing dust due to the forecast of high winds..."
DES Air Quality Forecast.JPG  Air quality forecast issued by DES for June 28 expecting Moderate PM10 AQI level on the day of the exceedance caused by southerly winds and blowing dust.
AirNow AQI Animation.gif  Animated maps of southwestern US showing yellow Moderate areas in California and Southern Nevada; it did not show the exceedance at the one site in Las Vegas.
DES Air Quality Index.jpg  Tables of AQI levels occurring on June 28 at stations in the DES monitoring network. The only station exceeding PM10 was Jerome Mack in the eastern Las Vegas valley, reaching an AQI of 107.
500MB.gif  Animated chart of 500 millibar upper-air pressure-height chart for southwestern US showing a deep, tight low pressure area centered near the Nevada/California/Arizona intersection south of Clark County late Friday moving into Arizona, being replaced by north then west winds early Sunday (6/28) and a sharp low pressure trough moving south through Nevada on Monday, 6/29.
Summary.pdf  Summary text for the PM10 exceedance on June 28 at the Jerome Mack site in the eastern Las Vegas valley. Visible dust areas correlated to the higher PM10 concentrations. Airflow trajectories originated in Southern California.
SFC.gif  Animated images of surface synoptic charts from June 27 at 0600Z (June 26 at 11 PM PDT) through June 30 at 0600 Z (June 29 at 11 PM PDT) showing a tight low pressure area in southern Nevada with a cold front approaching from the north.
AirNow Hysplit.JPG  Trajectories of air parcels arriving in Las Vegas during time of the highest concentrations on the exceedance day. All three trajectory lines at different heights show the same general pathway originating in the San Joaquin Valley of central California nad passing through the Mojave Desert into Southern Nevada.

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.