Discussion
Match each quantity in List I with what determines it in List II.
List I
A. Dispersion coefficients
B. Ventilation coefficient
C. Effective stack height
D. Pasquill class
List II
1. Mixing height and mean wind speed
2. Stability class and downwind distance
3. Wind speed with insolation or cloud cover
4. Physical stack height plus plume rise
Select the correct match.
Answer: D
Correct answer: A-2, B-1, C-4, D-3
Each quantity is matched to its determinants. The dispersion coefficients (A) are read from curves indexed by stability class and downwind distance (2). The ventilation coefficient (B) is mixing height times mean wind speed (1).
The effective stack height (C) is the physical stack height plus the plume rise (4), and the Pasquill class (D) is assigned from wind speed together with insolation or cloud cover (3). Note the ordering the list implies: the Pasquill class must be fixed first, since the dispersion coefficients cannot be read until it is known.
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