Today's Word of the Day means...
Fog that has become mixed and polluted with smoke.
A form of air pollution produced when sunlight causes hydrocarbons and nitrogen oxides from automotive emissions to combine in a photochemical reaction.
A haze or fog composed of water vapor, complex molecules, and suspended particles.
Note: In North America, the primary cause of smog is pollution from automobile exhaust.
Note: The Los Angeles basin, where pollutants can be trapped by inversions and the surrounding mountains, has frequent problems with smog, as do other major urban areas.
Note: The word smog is a combination of smoke and fog.