Doesn’t surprise me given the severity of fires up your way.
I drove back from mine and Jamie’s (@N6JFD) Double Goat event on Emma and was horrified at the extent and continuous smoke along the Eastern Sierras for almost 500 miles. We have a fire around Lake Isabella at the southern end of the Sierras that essentially filled up the Owens Valley with smoke coupled with your local threat, the Caldor fire.
Just for grins and while we were camping at the Emma (W6/ND-395) trailhead, I shone a bright torch/flashlight up into the night sky. It was like a science experiment to see the dense number of small particles rushing through the beam and that was what we were breathing. Impromptu video taken the next day a few miles south but essentially the same as further north in Mono County, CA Dense number of small particles in air we breath from CA fires