Discussion
The ventilation coefficient is defined as
Answer: C
Correct answer: Mixing height times mean wind speed
The ventilation coefficient is the product of the mixing height and the mean wind speed within the mixed layer, with units of metres squared per second. It combines the two things that dilute an emission: the depth available for vertical mixing and the rate at which air is carried through the area.
A large value means the atmosphere can disperse a given emission well; a small value - a shallow mixing height with light winds - signals poor ventilation and the likelihood of an episode. Dividing rather than multiplying, or bringing in stack height or stability class, gives no such physical meaning.
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