Modeling the Kinetics of Small Gas Impurities in Cramped Aerodynamic Conditions of the Urban Atmosphere

Abstract

The chemical transformations of a number of pollutants in cramped aerodynamic conditions of the urban atmosphere are considered. Those areas are located between buildings; they are with abnormally high concentrations of pollutants, and it leads to high reaction rates, significantly different from similar ones in an unlimited volume. In the course of numerical experiments the obtained stiff system of differential equations, which describes the kinetics of that process, is solved. For that, the Rosenbrock method is used under various initial conditions corresponding to variations in the concentrations of primary pollutants. Their quantitative contribution to the increase in the content of a highly toxic secondary pollutant is analyzed in detail. Moreover, the processes in this chemically active system occur rather quickly, before the substances leave the reaction zone.