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Event Year: Date:

DES M Resort Visibility Camera.jpg  DES M Resort Visibility Camera pictures view to north and northeast on January 3 at 0730 and 1600 PST. High clouds were present, with indications of low-level haze.
DES Air Quality Forecast.JPG  DES air quality forecast issued December 31 showing Moderate AQI levels of particulate matter (PM2.5 and PM10) occurring on January 3. The advisory for smoke related to fireworks had expired after January 1.
AirNow Daily AQI.JPG  AirNow Daily Air Quality Index (AQI) map for particulate matter within about 300 miles of Las Vegas for January 3. Yellow colored areas are a Moderate AQI, and orange is Unhealthy for Sensitive Groups (USG). The Las Vegas area only shows Moderate AQI.
DES Air Quality Index.jpg  DES Air Quality Index for each site in the DES network for January 3. The exceeding site, Sunrise Acres, is in the east-central portion of the Las Vegas valley.
AirNow Hysplit.jpg  AirNow Hysplit trajectory plots for 20, 200 and 800 meters above ground level in Las Vegas arriving at 0700 and 1900 PST on January 3, showing little air movement in the lower levels.
500MB.gif  Daily Weather Map 500 millibar synoptic chart for January 3, 2021 showing weak zonal flow aloft in the southwestern US.
Summary.pdf  The 24-hour NAAQS for PM2.5 was exceeded on January 3 at Sunrise Acres with an AQI level of 112. This site is in the east-central portion of the Las Vegas valley.
SFC.gif  Daily Weather Map surface synoptic chart for January 3, 2021 showing high pressure through the western US that corresponds to light winds and stable night hours.

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.