Funky Smell

Ok, so I've noticed this really funky smell in different places and I can't figure out what it is. It's in my classroom at school. I smelled it walking into the gym the other day. And I noticed it in the temple today. I thought it might be some type of material (i.e. plastic, wood). Then I thought it might be a person in particular, like something they have eaten is emanating from them. But it smells exactly the same in the different places. Is it a Portland smell? Vegans? Hippies? Organic nutsos? I really have no idea. Whatever it is I don't like it.... What do you think? I wanna hear some theories!