I went out to Yellowstone in October 2022…was pretty sunny and beautiful there. Was smoky before I left to go over there and nasty smoke persisted for another week or two once I was home. Sometimes we do get fairly persistent weak offshore flow and long bouts of smoke too.
Western WA really doesn’t deal with that much smoke, 2020 of course was a big smoke event, but otherwise it’s generally small bouts of smoky days. Southern OR and east of the crest have had several years recently with 20-30 smoky days from late July through mid September.