The nitric oxide from automobile exhaust when combined with oxygen in the air forms the brown color typical of smog. Smog is a common sight in Los Angeles and Denver as of the the late 1900s. Smog is called nitrogen dioxide.
Similarily, the nitrous oxides from automobile emissions that create smog also combine with hydrocarbons and when they are exposed to sunlight “a photochemical reaction takes place that results in the formation of ozone and other irritating compounds” (Infoplease). This shows how the presence of smog is not a good sign for decreasing global warming, obviously.
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