Scott makes a variety of Self Contained Breathing Apparatus (SCBA) devices. Mostly you see them used by fire-fighters, but Scott offers chemical industry and oil and gas variants. Check out their SCBA offerings here: https://www.scottsafety.com/en/us/Pages/ProductSeries.aspx?P...

I'm with you on needing more than that: anecdotally I was once advised to use an air filter plus nose clip in case of any accidental releases. I asked "Uh, like what?" "Oh, ammonia, that sort of thing." Needless to say if ammonia was released and it got to me I'd be blind anyway. :shrug: So based on entirely anecdotal experience I'd say yeah it's to hopefully help you run away. :-)

I've been told that some criminals like to keep ammonia in a squeeze bottle (like a jif lemon container) to be used as a weapon if necessary. Also handy that they can use it to clean their cocaine as well.