I'm a volunteer firefighter. I've wondered what my county's response would be if I borrowed one of our SCBAs (self-contained breathing apparatus) to wear to an anti-ICE demo or ICE observation incident. It's not a gas mask in the sense of this article, because as the name suggests it's an entirely self-contained air supply - it doesn't matter what is in the air at all. The one issue is that a single air bottle has a…
Do they refill with air? Or do you need concentrated oxygen or something?
You wouldn’t want to be breathing anything enriched with oxygen in a fire.