the.com/fumigation

means The process of exterminating pests, bacteria, or vermin by saturating an enclosed space with chemical smoke or gas.

from From Latin fumigare, 'to smoke' — a fusion of fumus ('smoke,' the same root that gives us 'fume' and 'perfume') and the verb-forming suffix seen in words like 'fustigate.' The Romans used it for fumigating with smoke to purify or disinfect, and the word drifted into English by the late 1300s/1400s meaning roughly the same thing it does now: drive out the unwanted by choking the air they breathe.