According to the Central Pollution Control Board $(CPCB)$,which particulate size in diameter (in micrometers) of air pollutants is responsible for the greatest harm to human health?

  • A
    $1.0$ or less
  • B
    $5.2-2.5$
  • C
    $2.5$ or less
  • D
    $1.5$ or less

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