I imagine water based fog lingers longer as well? I always like it how at HHN the fog generally covers the ground rather well and stays for a good period of time. Nitrogen based fog I guess is the opposite, hence why it is used for quick bursts on rides like Transformer? Anyway, fascinating how much thought has to go into things, how it is not just "let's have some fog", but one gas to actually consider different factors, really makes one appreciate things even more.The fog at HHN is water based. Your friend's pants are doing nothing but overheating him. In fact, the company HHN uses for fog is owned by a man with asthma. He sits in the stuff and breathes it all day. I order about 1 ton of the same fluid every year. Universal is one of their biggest clients.
"100% American Made - ... only uses De-Ionized Water and Pharmaceutical Grade Chemicals, all Approved by the FDA."