Discussion
An engineer computes a ventilation coefficient of 2800 square metres per second for a proposed industrial site.
How should this be interpreted?
Answer: C
Correct answer: As poor dispersion potential
A ventilation coefficient of \( 2800 \) square metres per second is low. The coefficient is the mixing height times the mean wind speed, and values below about \( 6000 \) are commonly taken to indicate limited capacity to disperse emissions, so this figure is a warning about the site.
It says nothing directly about stability class, though poor ventilation usually accompanies stable conditions, and it is certainly not irrelevant to siting - it is one of the standard screening measures for whether an area can absorb a new industrial load. A high value, not a low one, would indicate good dispersion.
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