Numerical simulation of air quality over a Tomsk city in light wind

A mathematical model and a numerical method for calculating meteorological parameters and quantities characterizing the quality of atmospheric air in the city, obtained using mesoscale models of numerical weather forecasting and impurity transport, are presented. The results of numerical calculations were compared with the data of observations performed with the instruments of the Central Collective Use Center “Atmosfera” of the Institute of Atmospheric Optics of the Siberian Branch of the Russian Academy of Sciences. The conducted studies have shown that the most unfavorable meteorological conditions leading to the accumulation of impurities near the earth's surface are observed in the morning and evening hours — this is a weak wind of variable direction and stable or neutral stratification of the surface air layer.