Discussion
Which of the following is NOT a weakness in the Gaussian Plume Model ?
Answer: A
The statement that is not a weakness is that the model does not evaluate dispersion in all three dimensions.
That statement is false: the Gaussian plume model is three-dimensional. It carries the plume along the wind direction x and spreads it in the crosswind (y) and vertical (z) directions with the dispersion coefficients σy and σz, so it does evaluate all three dimensions.
The other three are real limitations: the basic model treats the pollutant as inert, so it cannot handle chemically reactive pollutants; it assumes steady-state conditions of constant emission rate, wind and stability; and it is meant for short-range, short-period estimates, not as a long-term air shed evaluator.
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