Three-dimensional analytical model is widely used to analyse pollutants dispersion under the removal mechanisms using advection-diffusion equation is presented. Point source characteristics of atmospheric impurities from industrial stacks with fuel combustion ability is studied. The current article focuses on dispersal of primary impurities discharged from point source through large scale air stream. The effect of dry deposition and wet deposition diminishes the concentration of primary impurities within the upwind range of centre of urban heat island. Due to removal mechanisms, the density of primary impurities is being reduced on the surface area of urban metropolitan city.

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