Discussion
Pasquill stability classes run from
Answer: D
Correct answer: A for very unstable to F for stable
The Pasquill classes run from A, very unstable, through B and C (moderately and slightly unstable), D (neutral), to E (slightly stable) and F (stable). The class is assigned from surface wind speed together with incoming solar radiation by day or cloud cover by night, and it selects the dispersion coefficients used in the plume calculation.
The scale is therefore ordered from most to least turbulent, not the reverse, and it is not numerical. Nor does it separate day from night as such: neutral class D occurs in overcast or windy conditions at any hour.
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