Study of the spread of PM2.5 in the atmosphere of Rustavi and its environs.
2023
The spread of PM2.5 in the atmosphere of Rustavi city and the surrounding area during background easterly weak, medium and strong winds has been studied. It has been established that the maximum concentrations of PM2.5 in the atmosphere of Rustavi are almost always higher than the corresponding maximum allowable concentrations. The trend of hourly changes in concentrations showed that during the day the concentration of microparticles reaches its maximum in the various period of the day. Numerical modeling of the local distribution of microparticles in the city of Rustavi during weak, medium and strong background easterly winds showed that the change in the diurnal regime of terrain and temperature during the weak easterly wind in the city for 12 hours causes a complex and significant change in the landward wind speed. It generates a current against the background wind in the area of the Kvemo Kartli lowland, which corresponds to the horizontal gyral circulation of the wind. The size of the circulation gradually decreases with increasing height, and in the boundary layer of the atmosphere (600 m above the surface of the earth) it has the appearance of a wave disturbance. The image obtained during the medium background easterly wind is qualitatively similar to the field obtained during the weak background wind, and during the strong background easterly wind, in contrast to the case of weak and medium winds, the pollution zone covers a large part of the simulation area. Fig. 7, Ref. 4.
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