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Discussion

Fine particulate is more damaging to health than coarse particulate chiefly because it

  • A.Is more visible in the air
  • B.Settles more rapidly
  • C.Penetrates to the alveolar region
  • D.Contains more mineral matter

Answer: C

Coarse particles are largely trapped in the nose and upper airways and cleared within hours, while fine particles reach the gas exchange region. The association with cardiovascular as well as respiratory mortality follows from that deep deposition.

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