Chimney emission is a term used to describe the substances that are released into the atmosphere from burning fuel in a chimney. The two crossword solutions for this term are 'EMANATION' and 'STEAM'. EMANATION is a nine-letter word meaning the act of releasing something, such as a gas or odor, from a source. STEAM is a five-letter word meaning the vaporized form of water, which is often seen coming out of a chimney when fuel is burned.