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Question

Which is always present in photochemical smog?

A
O3
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B
CO2
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C
SO2
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D
CH4
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Solution

The correct option is A O3
Photochemical smog is formed from secondary pollutants. Secondary pollutants are formed due to the reaction between solar radiation and primary pollutants like nitrogen dioxide. Nitrogen oxides split into nitric oxide and nascent oxygen. Nascent oxygen forms ozone. Ozone, nitric oxide and PAN are the secondary pollutants
So, the correct answer is 'O3'


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