I suggest calling the local ranger station.

Air quality can vary a lot, but my experience in hiking not too-o far from fires has been mostly good. FWIW !

One sort of upside: you can get some spectacular sunsets, and views of the sun through smoke can at times make you feel like you're in a science fiction story.

But call the local rangers and get their current best guess.
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Brian Lewis
http://postholer.com/brianle