Well, I drove over the top in bad smoke pouring over every pass - Monitor, Sonora, Tioga, and Mammoth; and it was downright ugly in Mono Basin. But Virginia Lks and Rock Cr were very very clear. Then after chasing Tubby the Bear away from my camera pack, I drove over Tioga this morning thru the most crystal clear air I've ever seen up there in summer; and Mono Basin was clear down below. Where did all the smoke go? Turns out it was compacted like a smashed tire right around 6,000 ft on the western slope, which would include Yos Valley, the San Joaquin Valley, and yeah everything else all the way home here to the Bay. So glad I took a brief break in the high country. But now another wind change forecasted. So who knows?