I set up the monitor today, just waiting for the smoking to start, they do it after 4 pm now so only a bit longer until I see if the reading change. I have the monitor in front of my computer camera and am Zooming myself so I dont have to be there to breath in the toxi air. Anyway I figure I need proof because the facility manager keeps saying it is an odor and not smoke so it should not bother anyone. guess I have to have scientific proof!