GATE CE 2023 Set 1 — Question 50
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Environmental Engineering → Air Pollution
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Question
Which of the following statements is/are TRUE in relation to the Maximum Mixing Depth (or Height) ‘’ in the atmosphere?
Correct answer
(B) Ventilation coefficient depends on Dₘₐₓ; (D) Vertical dispersion of pollutants occurs up to Dₘₐₓ
Solution
Statement (B) is correct because the ventilation coefficient is defined as the product of the maximum mixing depth () and the average wind speed within that depth. Statement (D) is correct because represents the upper limit of the mixing layer, which is the region where vertical dispersion of pollutants is most significant. Statement (A) is incorrect as is determined by the intersection of the environmental lapse rate and the dry adiabatic lapse rate, not just the height of unstable air. Statement (C) is incorrect because a smaller restricts the volume available for dispersion, thereby increasing the air pollution potential.
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