We had big fires in 2000 (for just one example) and there was a layer of ash everywhere. I later read that orchards in the area were able to save money on fertilizer because they were able to apply less potassium.
So there is that silver lining. But just look at this map to get an idea of the impact of these fires!
Right now our visibility is probably a couple of miles, so we’ve seen worse. But the mountains are pretty well obscured and we’ve curtailed our regular morning walk to avoid the smoke. We have family in the Bay area and in W. Oregon, so we’re worried about them. Nasty business.