The Air Quality Index in my town is currently 260 (very unhealthy) due to a surge in wildfires in western Canada and the northwest US. There are additional smaller fires not shown on this map at this zoom level.
From the interactive map it looks like the worst air in the world right now.
I’ve had the AC filters, and they make a difference, just don’t forget to change them afterward. I also ended up buying one of those home air purifier things (something I never thought I’d do), and that’s helped with the air in my bedroom at night as well - I’m no longer waking up with headaches. That plus an N95 mask outside and I’m actually doing okay!
Consider sealing off the stove extractor fan (when not using the stove) if you have one, it was our biggest leak during the heavy smoke season.
Oh, thanks for that tip - that never occurred to me!