Investigation of atmospheric air pollution of Kutaisi with microaerosols

Abstract

Air pollution of Kutaisi with PM2.5 and PM10 was studied. The data obtained from operational observations and special experimental measurements conducted within the framework of atmospheric air pollution monitoring are used for the research. The maximum, minimum and average area of the annual, monthly and daily changes in the concentration of microaerosols, as well as their spatial distribution in the city and its surrounding area, have been determined. It is determined that the concentration of PM particles during the day is almost always characterized by an increasing trend and reaches its maximum after 20 hours. The study of Kutaisi atmospheric air pollution with PM10 is carried out by the joint integration of the 3D regional model of the evolution of atmospheric processes and the transfer-diffusion equation of impurities. Images of PM10 concentration change over time and spatial distribution were obtained. It is shown that the topography of the city and the surrounding area determines the generation of landward anticyclonic eddies of wind speed. The formed wind speed field contributes to the removal of PM10 from the city, the process of "self-cleaning" of the atmosphere. Calculations show that the process of spreading aerosols takes place in four stages and depends on the intensity of traffic, the location of highways and the terrain of the city. From 4 to 7 a.m. there is a rapid increase in concentration, from 7 to 3 p.m. - a weak decrease or constancy of concentration, in the interval from 3 p.m. to 9 p.m. there is an increase in concentration, and from 9 p.m. to 6 a.m. - city air self-cleaning. Areas of relatively high pollution are defined.