$A$ pollutant is any substance,chemical,or other factor that changes:

  • A
    Natural geochemical cycles
  • B
    Natural balance of our environment
  • C
    Natural flora of a place
  • D
    The natural wildlife of a region

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$A$ : $PAN$ is a secondary pollutant.
$R$ : $PAN$ is formed by interaction of nitrogen oxides and hydrocarbons in the absence of light.

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