Also found in: Thesaurus, Medical, Encyclopedia.
Related to smogless: smoggiest


 (smŏg, smôg)
1. Fog that has become mixed and polluted with smoke.
2. A form of air pollution produced by the photochemical reaction of sunlight with hydrocarbons and nitrogen oxides that have been released into the atmosphere, especially by automotive emissions.

smog′gy adj.
smog′less adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Physical Geography) free of smog; without smog
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
"I was born twice," announces Calliope "Cal" Stephanides, "first, as a baby girl, on a remarkable smogless Detroit day of January 1960; and then again, as a teenage boy, in an emergency room near Petoskey, Michigan, in August of 1976." Cal, it is revealed, is a hermaphrodite.
We watched the world change in high-definition thanks to a perfect blue sky over a smogless morning.
One would assume bikers to possess a modicum of common sense by virtue of using smogless and gasless devices for transportation, but that may be overly hopeful.