I think there is some sort of pesticide or maybe it the grass itself, but everyone I have talked to that went this year or past years says that after and during Coachella their lungs feel like crap. Maybe it is all the smoke from the cigarettes, agricultural pollution, etc, but I doubt it. Could anybody confirm my suspicions?
Another thought...I am not a germaphobe, but could you imagine the potential to spread diseases that Coachella has? I saw some really sick people that were jumping up and down right next to me and some guy that looked like he had small poxes.