https://www.washingtonpost.com/news/wizards-insider/wp/2018/01/07/a-strange-odor-during-wizards-game-leaves-fans-with-concerns-and-questions/?utm_term=.ce9bff31820c
I found this article and thought it was quite interesting. Basically, an entire section had to leave the arena during a basketball game because they were coughing and sneezing due to some unknown irritant. When they investigated the area after everyone left, nothing was found. I personally don't think this was caused by a person with PATM, but there is a small chance.
Just wanted to share.