Not saying this idea is perfect as a real gas mask is of course better. But in a emergency situation this could stage off tear gas or pepper spray.
https://m.youtube.com/watch?v=A7SKAPN0zJAp
Seems to work,
https://m.youtube.com/watch?v=KOdK2qqq1-g
Jason.
https://m.youtube.com/watch?v=A7SKAPN0zJAp
Seems to work,
https://m.youtube.com/watch?v=KOdK2qqq1-g
Jason.