Miasma is a noun that means an unpleasant smell or vapor.
Our word of the day has been around since the Mid-17th century, but its roots go back to the Greeks. Defilement in Greek is mólynsi moe EES ee). Keep in mind that while miasma means unpleasant smell, it usually represents more than just your ordinary bad smell.
The miasma coming from the dumpster outside was a clue that there were dangerous chemicals around. The smells Mr. Brooks discerned were far more toxic than the typical dumpster scents.