ABSTRACT
This chapter provides an overview of analytical models for the treatment of dispersion of air pollutants in low wind conditions. Analytical models are not only indispensable tools to predict the concentration of air pollutants with high mathematical accuracy but are also the easiest way to describe the unstructured temporal and spatial behavior of the pollutants in the atmosphere. The Gaussian puff model allows for the diffusion of pollutants in all three directions and described the pollutant dynamics by the temporal evolution of plume segments, while the plume segment approach helps in tracking the trajectory of the plume. There are many diffusion models for the dispersion of pollutants in atmosphere for continuous and instantaneous source releases. A general parameterization of eddy diffusivities for the treatment of near-source dispersion is desired for the formulation of a more realistic dispersion model valid for all wind speeds.
