Discussion
Which assumption limits the Gaussian model most severely?
Answer: A
The model assumes the wind is constant in direction and speed and the turbulence uniform, which fails over complex terrain, near coastlines and during the morning and evening transitions. Ground level sources are handled by placing the source at zero height. Chemistry is a genuine additional limitation for reactive species but the meteorological assumptions bite first. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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