Bad odors may be having a negative effect on your mood, behavior and health, even when they're not consciously registered -- and therefore unavoidable.
Ever notice that when you enter a building or a room for the first time, its smell is distinct? Still, you may barely perceive any odor when entering your own home.
What's going on? It's not because there are less olfactory molecules floating in the air where you live, but because you have just adapted to the smell. With constant or repeated exposure, sensitivity to certain odors declines.