While an inversion layer has been trapping air pollution at low altitude across the state of California for days, it's had an amazing side effect -- the air *above* the inversion layer is absurdly clean.
According to Wikipedia, the best possible visibility under ideal conditions is about 150 miles. In our case, we were getting over 100 for sure, and probably significantly more. The view west from Sequoia National Park let us see clear to the coastal range above the sea of haze, and to the east we had a crisp view of the high Sierras.
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