Miasma

n.

1.

Infectious particles or germs floating in the air; air made noxious by the presence of such particles or germs; noxious effluvia; malaria.

Noun	1.	miasma - an unwholesome atmosphere; "the novel spun a miasma of death and decay"
	2.	miasma - unhealthy vapors rising from the ground or other sources; "the miasma of the marshes"; "a miasma of cigar smoke"

BO, afterdamp, bad breath, bad smell, blackdamp, body odor, breath, chokedamp, cloud, coal gas, damp, effluvium, exhalation, exhaust, exhaust gas, fetid air, fetidity, fetidness, fetor, firedamp, flatus, fluid, foul breath, foul odor, frowst, fume, graveolence, halitosis, malaria, malodor, mephitis, nidor, noxious stench, offensive odor, puff of smoke, reek, reeking, rotten smell, smoke, smudge, steam, stench, stench of decay, stink, vapor, volatile, water vapor