Meaning of antismog

an•ti•smog

Pronunciation: (an"tē-smog', -smôg', an"tī-), [key]
— adj.
  1. designed to reduce smog by reducing the pollutants released into the earth's atmosphere: an antismog device for a car's exhaust.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.