Overview

Different kinds of two-dimensional numerical models of primary and secondary pollutants with removal mechanisms are presented in detail in this book. The effect of air pollution with reference to area source and point source along with large scale and mesoscale wind velocity profiles are discussed in detail. One of the important atmospheric phenomena is the conversion of air pollutants from gaseous to particulate form. The primary pollutants which are emitted directly to the atmosphere are converted into secondary pollutants by means of chemical reaction. The effect of removal mechanisms such as dry deposition, gravitational settling are also discussed. The governing partial differential equations of primary and secondary pollutants are solved by using Crank-Nicolson implicit finite difference technique. Consistency, stability and convergence criteria have been tested for the numerical scheme used in various models. Concentration contours are plotted and the results are analyzed for primary and secondary pollutants in stable and neutral atmospheric conditions for various meteorological parameters and transformation processes.