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.
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!