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Concentrations of cloud condensation nuclei in clean maritime air are typically of the order of

  • A.10000 per cubic centimetre
  • B.1 per cubic centimetre
  • C.1000000 per cubic centimetre
  • D.100 per cubic centimetre

Answer: D

Maritime values of roughly a hundred contrast with continental values of several hundred to a few thousand. Polluted continental air can exceed several thousand per cubic centimetre routinely. The range across the globe spans roughly two orders of magnitude.

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