Bad Air Historically Thought to Cause Disease

This page is the CodyCross answer for the clue below from All Things Water, Group 1286, Puzzle 2 (Streams and Swamps).

Question is: Bad Air Historically Thought to Cause Disease

and the answer is: MIASMA

Word Meaning:

MIASMA — A noxious atmosphere or emanation once thought to originate from swamps and waste, and to cause disease.

Definitions from Wiktionary.