Funny this ordinance has been passed. While at University, I used to drive the transit buses (natural gas and also 1940s London Double-Deckers) that were mainly utilized by the students. One day a guy got on and sat right behind me - he smelled so bad that my eyes watered and my nose burned. I'm not exagerrating, not even when I say I felt I could taste it it smelled so bad. I had to open my window despite it being 30 degrees outside. After he left, it took 30 minutes for the odor to dissipate! I can remember saying to myself, "There oughta be a law...."