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PM2.5 refers to particulate matter with an aerodynamic diameter

  • A.Exactly 2.5 micrometres
  • B.Between 2.5 and 10 micrometres
  • C.Below 2.5 micrometres
  • D.Above 2.5 micrometres

Answer: C

The fraction penetrates deep into the alveolar region and is the size class most strongly associated with cardiopulmonary mortality. Its long atmospheric residence time also makes it a regional rather than a local problem.

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