I posted one of 2 shots I took of the tragic Camp/Paradise Fires that hit near Chico, CA. These fires were aprox. 160+ miles from where this photo was taken. This was the worst fire smoke the Bay Area of San Francisco has ever seen. This was on Monday 11-11-18, 4 days after the fire broke out. The proceeding days the smoke more than doubled in thickness; to the point you couldn't even see Mt Tam, from this vantage point in this same photo, Thurs. or Friday this week. The Air Quality is the worst these past 2 days, of any where in the World, from what I've read.
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