Determine the Pasquill stability category for the following scenarios and the type of plume to be observed from a smokestack.

a. An overcast day with leaves rustling.
b. A sunny afternoon with the solar altitude 75 degrees above the horizon and loose paper blowing on the street.
c. A sunny afternoon with the solar altitude 75 degrees above the horizon and smoke from a match rises vertically.
d. A later summer day with broken low clouds and smoke from a match rises vertically.
e. Nighttime when chimney smoke drifts but does not move wind vanes.
f. A winter day when chimney smoke drifts but does not move wind vanes.

What will be an ideal response?


a. ???? = 4?7 ????????? ;???? ???????? ????

b. ???? = 13?18 ????????? ;????

c. ???? < 1 ????????? ;????

d. ???? < 1 ????????? ;????

e. ???? = 1?3 ????????? ;????

f. ???? = 1?3 ????????? ;????

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