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Question

Examples of secondary air pollutants is/are
  1. Smog
  2. PAN
  3. O3
  4. All of the above

A
PAN
B
All of the above
C
Smog
D
O3
Solution
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Secondary pollutant is an air pollutant that do not emit directly from the source but forms when primary pollutant reacts in the atmosphere. For example O3 and PAM forms when hydrocarbon reacts with nitrogen oxides in the presence of sunlight, smog forms when industrial or vehicle fumes reacts with sunlight in atmosphere. Thus, the correct answer is 'All of the above'.

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