From a stability perspective, there's been little change over the past couple of days. The inversion remains very strong, with a temperature increase of about 13ºC sitting on top of the valley cold pool.
During this period, the 24-h average PM2.5 concentrations at the DAQ sites in Logan and North Provo climbed fairly steadily. Utah County is now approaching a putrid 100 ug/m3.
|Source: Utah DAQ|