Discussion
Which of these is NOT a Gaussian model input?
Answer: A
Correct answer: The ground level concentration
The ground level concentration is the model's output, the quantity being predicted. Everything else listed must be supplied first: the emission rate \( Q \) from the source, the wind speed \( u \) from measurement, and the dispersion coefficients \( \sigma_y \) and \( \sigma_z \) from the Pasquill-Gifford curves at the stability class and distance in question.
The distinction is worth keeping clear when a model disagrees with monitoring data, since the discrepancy must lie in one of the inputs or in the model's assumptions, never in the output itself.
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