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The dispersion coefficients in a Gaussian model depend on

  • A.Terrain roughness alone
  • B.Downwind distance and stability class
  • C.Stack height and gas temperature
  • D.Emission rate and wind speed

Answer: B

They are read from curves or correlations indexed by stability and distance, and they are what distinguish an unstable day from a stable night. The emission rate scales the whole concentration field but does not change its shape.

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