What carries odor in the air?

Answer 1

This is actually quite gross .... be warned.

Nothing carries odor. The "odor" is actually tiny physical pieces of the item in question that the nose has cells to detect and analyze. So when you are smelling something, you are actually sensing the actual item. So if you smell a flower, you are actually sensing the molocules and other compounds in the oils and other constitutes of the flower. If you smell perfume, its because you are detecting the same thing; the actual oils that constitute the perfume. If you smell pine wood, there are tiny microscopic pieces of wood going in your nose.

This also includes bad odors as well....