dust eater

how many types of BO are there? the really pungent smell that floats as this person walks past, and the one that was accumulating in the (air-con/no window) bus on the way home, was so similar. it's like when i clean up the rabbits' dirty newspapers, stuff them in the plastic bag, press the bag down, and all the urine/toxic gases get pushed out onto my face.
i get worried when i don't notice the smell anymore.