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Question

Out of SO2, CO, O3, NO and peroxyacetyl nitrate (PAN), the primary and secondary pollutants are: 
 
  1. Primary- SO2,O3,NO
    Secondary- CO,PAN
  2. Primary- SO2,NO
    Secondary- PAN,O3,CO
  3. Primary- SO2,CO,NO 
    Secondary- PANO3 
  4. Primary- PAN,O3
    Secondary- SO2,CO,NO


Solution

The correct option is C Primary- SO2,CO,NO 
Secondary- PANO3 
Air pollutants which are directly emitted from a source are called Primary pollutants 
Examples: CO,NO,SO2

Air pollutants which are formed by the reaction of primary pollutants are called Secondary pollutants 
Examples: PAN,O3   

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