Yup, this is a great case of the partial mix out. The winds pick up and it cools off just enough to mix things out at the benches and to improve the air quality somewhat, but not enough to get us to pristine air.
As things stand this morning, there's still a fairly strong inversion at low levels over the valley where temperatures increase from 1.2ºC at the surface to 8ºC at 850 mb (about 5300 feet). The pollution is confined primarily to the lower portion of this inversion layer along the valley floor.
The Trax-mounted PM2.5 sampler this morning has been moving along the green line from the airport to West Valley City. Concentrations are solidly in the moderate air quality category.
|PM2.5 concentrations during the hour ending at 8:05 AM MST. Source: http://meso1.chpc.utah.edu/mesotrax/cgi-bin/mesotrax_map.cgi|
Kudos to everyone at the U who has contributed to collecting all this great PM2.5 data. It's very illuminating!