Numerical Modelling of PM10 Propagation in Rustavi City Atmosphere During the Southern Background Wind

Abstract

According to observations, experimental measurements, and numerical modelling, the atmospheric pollution caused by microaerosols PM2.5 and PM10 in Rustavi city, one of Georgia's industrial centres, has been estimated. Analysed were the fluctuations in concentration of pollutants in the urban atmosphere on a monthly, daily, and hourly basis. The particle concentrations in the atmosphere of Rustavi City reach their highest levels at any hour of the day due to the combined influence of motor vehicle traffic and industrial facilities. The distribution of PM10 particles in the atmosphere has been determined using numerical modelling for scenarios involving background light air, a mild breeze, and a fresh breeze. Calculations demonstrated that light air and mild breeze cause a rise in the concentration of microaerosols in the urban atmosphere, but fresh breeze facilitates the dissipation of the pollution cloud, albeit expanding its distribution area.