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Which of the following is NOT a classical plume type?

  • A.Lofting
  • B.Downwashing
  • C.Coning
  • D.Fanning

Answer: B

Correct answer: Downwashing

The classical plume types are named for the stability profile that produces them: looping, coning, fanning, lofting, fumigation and trapping. Downwash is not among them - it is an aerodynamic effect of the stack or a nearby building, and can occur in any stability class.

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