|Looking east at the dust obscured Wasatch Range from the University of Utah at 10:25 AM 27 July 2015|
Now here's what's interesting. If you thought yesterday was bad, Pioneer Day was worse if you were in an area that was affected by the fireworks. The PM2.5 trace below is from the DAQ sensor at Hawthorne Elementary, just south of Liberty Park. You can see the bump in PM2.5 concentration yesterday morning to a maximum of around 18 ug/m3 (the DAQ observations are hourly averages, which results in a lower peak than seen in the higher frequency data from out mountain meteorology lab), but if you go back to the evening of the 24th (Pioneer Day), the peak is much higher, reaching 47 ug/m3. That peak was likely produced by the Liberty Park fireworks.