a poisonous mixture of gases containing carbon dioxide, carbon monoxide, and nitrogen formed after the explosion of firedamp in coal mines
See also whitedamp
afterdamp in American English
(ˈæftərˌdæmp; ˈɑftərˌdæmp)
noun
an asphyxiating mixture of gases remaining in a mine after a fire or an explosion of firedamp, usually consisting mostly of nitrogen and carbon dioxide