OSHA has limits of something like 25
ppm for people working in industry, apparently over that amount of
ammonia in the air is bad for the lungs. As they were talking, the meter went over 25, then over 40, then over 60, then I think it stopped in the 70s or 80s. And the people were all standing and talking in the room, so it is not like they would automatically keel over or anything.