pm 2.5 in Logan is 75 micrograms/liter, rivaling Beijing for the most polluted air in the world. so I ran the canyon again,above the inversion, temperature difference of 20 degrees above the inversion and clear unpolluted air. you can tell where the inversion level is simply by watching the thermometer- went from 24 degrees to 40 degrees in one mile around RHF.
7 miles @7:23
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