I’m in Canada and a few weeks back I was leafleting neighborhoods in smoke like this, literally spent all day walking outside in it. I wore a big cartridge-filter mask and that made it fine, but I was baffled by how many people were baffled by the mask. They thought I was making some kind of statement about Covid. I had to gesture vaguely at the sullen orange sky and remind them that there was smoke in the air. I’m sure PPE like that mask would have been mandatory if I’d been working inside a building with air like that.