smoke, gas, or something similar that smells strongly or is dangerous to breathe in diesel/petrol/exhaust fumes to be overcome by smoke and fumes Clouds of toxic fumes escaped in a huge chemical factory blaze. The body of a man was found in a fume-filled car yesterday.Extra examples Clouds of toxic fumes escaped from the chemical plant. Sometimes exhaust fumes escape into the vehicle. The fire gave off choking fumes. an industrial process which produces toxic fumes Benzene is found in car exhaust fumes. He lit a cigarette which ignited the petrol fumes. She was overcome by smoke and fumes.