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The distance at which the maximum ground level concentration occurs increases with

  • A.Emission rate
  • B.Stack diameter
  • C.The pollutant's density
  • D.Effective height and stability

Answer: D

Correct answer: Effective height and stability

A plume released higher must spread further vertically before it touches the ground, so the maximum moves downwind as effective height increases - and further still in stable air, where the dispersion coefficients grow slowly with distance. Emission rate changes the magnitude of the maximum but not where it occurs.

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