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antismog

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

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