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"Classic Smog" is the rich, heady mixture of fog, sulfur dioxide and coal smoke particulates that were found in London England in the early 1900's.

"New Improved Smog" also known as photochemical smog is the result of nitrogen oxides and volatile hydrocarbon reacting in the presence of sunlight to form ozone, associated polycyclic aromatics and a brown haze popular in modern cities. Especially ones with lots of cars, stagnant air masses and abundant sunshine.

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