antismog

[an-tee-smog, -smawg, an-tahy-]
adjective
  1. designed to reduce smog by reducing the pollutants released into the earth's atmosphere: an antismog device for a car's exhaust.

Origin of antismog

First recorded in 1965–70; anti- + smog
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018