We remain mired in the inversion, but there are some curious oddities with the PM2.5 concentrations that warrant analysis by people who know more about emissions and air chemistry than me.
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.
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| Source: Utah DAQ |
In contrast, the 24-h average PM2.5 concentrations in Ogden and Salt Lake have declined somewhat.
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| Source: Utah DAQ |
Perhaps someone can chime in and explain these declines. Yes, there are differences in the magnitude and timing of weekday and weekend emissions, but why would Logan and North Provo keep climbing steadily while Salt Lake and Ogden decline? Chew on that while I get back to football.
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