A policeman stands outside the NYSE and the newspaper cation reads "ready for anything...". The policeman's respirator is only held by one strap, making any protection very low. The other strap is dangling.
Respiratory protection
I travelled by air to Rockhampton by air recently to deliver an introductory occupational hygiene course for a client. I like to demonstrate industrial ventilation and one of the things I was unable to take on the plane with me was a Drager Smoke Tube.