A researcher uses a conventional Gaussian plume model to estimate New Delhi pollution caused by nearby-state stubble burning, which emits particles, VOCs, NOx and sulfur oxides. Which limitations apply?
Steady conditions assume constant wind speed, direction and emissions.
Wet and dry deposition are not accounted for.
Chemical pollutant transformations are not handled.
It needs more computing resources than chemical transport models.
Correct answer: (A) Steady conditions assume constant wind speed, direction and emissions.; (B) Wet and dry deposition are not accounted for.; (C) Chemical pollutant transformations are not handled.
Explanation
A classical steady Gaussian plume model simplifies meteorology and emissions and treats a conservative plume without deposition or atmospheric chemistry. These can be major limitations for regional stubble-burning transport. Chemical transport models are generally computationally more demanding, so D reverses the comparison. Select **A, B, C**; advanced Gaussian implementations can add some omitted processes, but the question concerns the conventional model.
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