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Question

'Smog', which means 'smoke' plus 'fog', irritates eyes and the throat. Smog is mainly caused by pollutants from automobiles and industries when they:

A
hit a dense shower of snow flakes
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B
react photochemically, due to the effect of ultraviolet light
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C
form a smoke ring
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D
react with oxygen in the air due to lightning electrical discharge from clouds
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Solution

The correct option is B react photochemically, due to the effect of ultraviolet light
Smog is especially common from automobile exhaust. A chemical reaction between solar ultraviolet radiation and an atmosphere polluted with hydrocarbons and oxides of nitrogen causes photochemical smog.

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