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

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