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Event Year: Date:

DAQ Meteorological Hourly Averages.jpg  DAQ Meteorological Hourly Averages valid for 1 January. This set of data is reported by the DAQ sites and includes resultant wind speed and direction, maximum gusts, and temperature. Data indicates winds were light and variable for the period.
DAQ Air Quality Index.jpg  DAQ Air Quality Index data valid for 1 January. The data shows the Air Quality Rating for each site in the DAQ network. For this period, 2 sites exceeded the Federal Standard for pollutant reaching the Unhealthy level (Sunrise Acres AQI 157) and the Unhealthy for Sensitive Groups level (Jerome Mack AQI 143) for Particulate Matter 2.5 (PM2.5) due to the New Year’s Eve fireworks. Note that the PM2.5 pollutant is rated on a 24hr average from midnight to midnight.
DAQ Forecast.JPG  DAQ Air Quality Forecast valid for December 31 through January 4.
200MB.gif  200MB animation valid from 31/12Z Dec to 3/06Z Jan in 6-hour increments. Data shows PFJ outlining a Ridge moving into the area from the West for the period.
NWS Forecast Discussion.pdf  NWS Forecast Discussion valid for December 31/3:23AM PST to January 2/4:06AM PST. This NWS product discusses and updates forecasted and current conditions for our area. Discussion forecasted light, variable winds for New Year’s Eve. All significant weather and winds were forecasted to occur on the afternoon of 1 January as a cold front moved through S NV.
AIRNow Peak AQIs.jpg 
700MB VV.gif  700MB Vertical Velocity animation valid from 31/06Z Dec to 3/06Z Jan in 6-hour increments. Data shows significant moisture before and after New Year’s Eve as Ridge moves over the area. All significant precipitation remains to the N and S of the area.
850MB.gif  850MB animation valid from 31/06Z Dec to 3/06Z Jan in 6-hour increments. Animation shows weak gradient with light northerly winds over the Las Vegas Valley. Winds were strong before and after New Year’s Eve.
AirNow AQI Animation.gif  AirNow AQI Animation valid for 1 January. The animation shows an area of an AQI higher than Unhealthy for Sensitive Groups developed over Las Vegas extending towards the N-SE between approximately 12:20am to 3:00pm PST.
NWS Observations.pdf  NWS Observations for McCarran International Airport, Nellis AFB, and the North Las Vegas Airport valid from 31 December to 2 January. During this period, the weather observation reported no significant weather with winds becoming light from the NW-N on the evening of 31 December through the early morning hours of 2 January.
500MB Absolute Vorticity.gif  500MB Absolute Vorticity animation valid from 31/06Z Dec to 3/06Z Jan in 6-hour increments. Data shows Ridging from the W with no significant energy moving over the area through the period.
500MB.gif  500MB animation valid from 31/12Z Dec to 3/06Z Jan in 6-hour increments. This animation is a reflection of the 500MB Absolute Vorticity charts. It shows increasing heights as ridge builds in from the W into the area.
Summary.pdf  Two sites in the Las Vegas valley exceeded the fine particulate matter (PM2.5) 24 hour NAAQS during 1 January due to pollutants trapped in the surface layer of the atmosphere, including smoke generated by the New Year’s holiday fireworks.
DAQ Pollution Hourly Averages.jpg  DAQ Pollution Hourly Averages for PM2.5 and PM10 valid for 1 January. Values that exceeded the Federal Standard for pollutant for PM2.3 and PM10 have been shaded in light red. The values reached the exceedance levels at midnight. PM10 exceedance hourly value decreased back into the Moderate level in the morning at 3:00am for Jerome Mack (Site ID 540) and 7:00am for Sunrise Acres (Site ID 561). PM2.5 exceedance hourly value did not decrease into the Moderate level for both sites until 9:00am.
SFC.gif  SFC animation valid from December 31/06Z to January 2/12Z in 6-hour increments. Animation shows High pressure dominating the SW US with a weak gradient as a couple of Cold Fronts try to move over into the NW US. Wind flow over the area was light and variable.
DAQ Advisory 20191231 Smoke NYE.pdf 

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.