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Event Year: Date:

Smoke Analysis.jpg  Two daily North America depictions of smoke areas based on satellite imagery on September 7 with extensive smoke coverage shown as shades of brown, and less in Nevada on September 8.
Satellite Animation 8.gif  Time lapse satellite imagery of the Western US and Eastern Pacific showing wildfire smoke clearing from Nevada during the daylight hours.
DES Air Quality Forecast.jpg  Air quality forecasts issued by DES for September 7 and 8 showing USG ozone and PM USG AQI levels on the days of the exceedances.
AirNow Daily AQIs.jpg  Four graphical map images of daily ozone (right column) and PM2.5 (left column) AQI levels occurring in the southwestern US on September 7 and 8, 2020. The orange areas are USG AQI areas. The PM levels exceeded both days, and ozone did not go higher than the Good range.
DES Air Quality Advisory 7.pdf  The Smoke, Ozone for wildfire smoke from regional fires issued by DES on September 7 for the day.
AirNow AQI Animation 7.gif  Animated maps of southwestern US showing orange USG areas in California spreading and intensifying during the day in California, and a small area in the Las Vegas valley.
DES Air Quality Index.jpg  Tables of AQI levels occurring on September 7 and 8 in the DES monitoring network. For each day, the full network report is in the top row and the detail of stations in Greater Las Vegas in the second row. All stations exceeded the 24-hour PM2.5 NAAQS on September 7, and nearly all stations exceeded the 24-hour PM-10 NAAQS on September 8, with one station reaching the Unhealty AQI level for PM2.5 on September 8.
AirNow Hysplit 8.JPG  Air parcel strajectories arriving in Las Vegas late afternoon prior to the frontal passage on September 8, 2020. Most of the region showed satellite-detected smoke coverage indicated by grey shading. Airflow originated northeast of Las Vegas.
DES Air Quality Advisory 8.pdf  The Smoke, Dust Advisory for wildfire smoke from regional fires and dust from high winds issued by DES on September 8 for the day.
500MB.gif  Animated chart of 500 millibar upper-air absolute vorticity pressure-height charts (approximately 18,000 feet MSL) from 9/6 0600Z through 9/9 00Z for southwestern US showing a high pressure area in Nevada to start, giving way to a strong low pressure system from Utah passing through the Eastern Great Basin and northerly winds through Nevada.
Summary.pdf  PM2.5 and PM10 exceeded the NAAQS on September 7 and 8, 2020 due to an unusual combination of exceptionally heavy smoke from California wildfires on the first day and into the second day followed by a frontal passage from the north with high wind speeds during the early morning hours of the second day.
AirNow Hysplit 7.JPG  Air parcel strajectories arriving in Las Vegas late in the afternoon on September 7, 2020. Most of the region showed satellite-detected smoke coverage indicated by grey shading. Airflow originated northeast of Las Vegas.
DES M Resort Visibility Camera Sep 7.gif  Hourly pictures from DES visibility camera on the roof of the M-Resort in the southern Las Vegas valley to the north on September 7, showing all landmarks obscured by smoke.
Satellite Animation 7.gif  Time lapse satellite imagery of the Southwestern US and nearby Eastern Pacific showing wildfire smoke from California spreading into Nevada and Clark County.
SFC.gif  Animated images of surface synoptic charts starting with a weak high pressure pattern in Nevada and California, and a cold front moving from north to south passing Clark County at 1200Z, 0500 PDT, on September 8.
AirNow AQI Animation 8.gif  Animated maps of southwestern US with similar trends as seen on September 7, with some differences in timing and the AQI in Southern Nevada did not go higher than the USG level.
DES M Resort Visibility Camera Sep 8.gif  Hourly pictures from DES visibility camera on the roof of the M-Resort in the southern Las Vegas valley to the north on September 8, showing all landmarks obscured by smoke through 1000 PDT, followed by clearing and then blowing dust late in the afternoon.

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.