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RuthieHamilton
Photochemical smog is the chemical reaction of sunlight, nitrogen oxides and volatile organic compounds in the atmosphere, which leaves airborne particles and ground-level ozone. This noxious mixture of air pollutants may include the following: Aldehydes. Nitrogen oxides, particularly nitric oxide and nitrogen dioxide.
AL2006
The word itself ... "smog" ... is a word made up from "smoke" and "fog".
That's all it takes to make smog and cover a whole valley with it.

Chemical smogs may also contain one or more of a whole list of
atmospheric pollutants. (For a great list, see the other answer
posted here.)  But they're not required.  All you need to make smog 
is some water-fog with some smoke in it.

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