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Q.

Which of the following is a secondary air pollutant? 

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a

Ozone

b

Carbon dioxide

c

Carbon monoxide

d

Sulphur dioxide 

answer is A.

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Detailed Solution

●        Ozone is a secondary air pollutant i.e. the pollutant does not have any direct source to emit while primary pollutants have a direct source to emit.
●        Ozone is formed by the combination of hydrocarbons (produced by combustion of fuel) and nitrogen oxide (produced by smoke and gases from industries & automobiles).
  
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