FWIW I was camping and hiking in Yosemite from Oct 26-31. At the beginning on Oct 26 it was noticeably hazy in the Valley and at night there were many visible particles in a flashlight beam, as if downwind from a campfire. Hiking out to higher elevation, it seemed like the haze was strongest at lower elevations. Not sure there was an actual inversion layer trapping it, but there was no smoke in a flashlight beam in Little Yosemite Valley (6100 feet ASL) or up at 9000 feet. Blue sky for several days while hiking, but in longer distance views such as from famous viewpoints, it was still clearly hazier than usual.
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