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.
from The American Heritage Dictionary of the English Language, 4th Edition
Fog that has become mixed and polluted with smoke.
from The American Heritage Dictionary of the English Language, 4th Edition
A fog made heavier and darker by smoke and chemical fumes.
from Free Scrabble Dictionary
A photochemical haze caused by the action of solar ultraviolet radiation on atmosphere polluted with hydrocarbons and oxides of nitrogen especially from automobile exhaust.
from Free Scrabble Dictionary
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