Discussion
Assertion (A): The Pasquill class must be established before dispersion coefficients can be read.
Reason (R): The coefficients are tabulated against stability class and downwind distance.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both statements are true and the reason is the explanation. The Pasquill class must be established first because the dispersion coefficients are tabulated against stability class and downwind distance; without a class, there is no curve to read.
This fixes the order of a plume calculation: assign the class from wind speed and insolation or cloud cover, read \( \sigma_y \) and \( \sigma_z \) at the distance of interest, compute the effective stack height, and only then evaluate the concentration. It also explains why the class matters so much - it enters the answer through both dispersion coefficients at once.
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