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Discussion

The plume behaviour in which a stable layer lies below the stack and unstable air above is called _____.

  • A.trapping
  • B.lofting
  • C.fumigation
  • D.fanning

Answer: B

Correct answer: lofting

Lofting - stable below and unstable above. The plume disperses upward while the stable layer beneath prevents anything from mixing down, so ground-level concentrations are very low.

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