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write the three-dimensional Gaussian model dispersion for the atmospheric pollution

problem. Modify the model under the following assumptions:

(i) Wind velocity is in only y -direction.

(ii) Mass transfer due to bulk motion in the y -direction overshadows the

contributions due to mass diffusion.

(iii) Motion is in steady state.

(iv) Wind speed is constant.

(v) Diffusivities are constant in all the directions.