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

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

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