The pollution layer over the Salt Lake Valley remains today (Saturday) but clearly shallowed over the past few days.
The photo below was taken at 0743 MST Tuesday.
You can compare that with the one below taken at 0745 this morning.
So, some temporary relief in some upper-bench areas.
On the valley floor, there was also some improvement, with PM2.5 this morning at Rose Park being lower than it has been in a few days.
All of this is evidence of top-down mixing with the pollution being mixed out from the top down. Sadly, it has not all been removed on the valley floor.
What remains after today we will probably be stuck with again for a while.
What causes the daily peaks? That almost looks like a plot of temp rather than PM.
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