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car smog, mostly.
Classic smog is a mixture of coal smoke (containing particulate and sufur dioxide) and fog.
fog or smog
smoke,fog
Acid Rain for Starters.
you tell me
Its considered secondary, but it can form from primary causes I heard.
Ozone is a key component of smog. Smog forms when pollutants such as nitrogen oxides and volatile organic compounds react in the presence of sunlight to create ground-level ozone. High levels of ozone in smog can be harmful to human health and the environment.
The area's smog usually returns within a couple of days.
Particulate carbon in the air causes smog and can cause respiratory distress.
You cannot use CFC's anymore