Think the inversion is over and done with for the year? Think again.
The photo above was taken this afternoon looking down Little Cottonwood Canyon. Yuk! The last day of February is sometimes used to mark the end of the winter pollution season, but that's not because the pollution goes away. It's because inversions are less frequent and persistent in March.
Today, however, we certainly have a deep series of stable layers and inversions in place over the Salt Lake Valley. Check out this morning's sounding.
As a result, there's plenty of smog around and PM2.5 levels are on the rise.
|Source: Utah DAQ|
I'm not sure if the source of this dust is regional, driven by the strong winds from Tuesday, or global (there are events where dust from Asia is transported across the Pacific and into the western US). I suspect the former. We'll probably see more of it this spring.