Q.

Which of the following is a secondary air pollutant?

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a

Oxygen

b

Carbon monoxide

c

Ozone

d

Nitrogen Dioxide

answer is B.

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Detailed Solution

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  • Secondary air pollutants are formed in the lower atmosphere by chemical reactions. 
  • The two examples are ozone and secondary organic aerosol (haze). 
  • Secondary pollutants are harder to control because they have different ways of synthesizing, and the formation is not well understood.
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