The diurnal variation of the concentration of anthropogenic air pollution in the cities of Belarus

     Anthropogenic pollution of the urban air is a serious problem for many countries. Naturally, the main factor in the prevention of air pollution is the reduction of harmful emissions. However, the meteorological conditions also have an important effect on the content of pollutants in the urban air Mainly the wind contributes to the removal of pollution from it And the vertical stability of the atmosphere, which determines the effectiveness of air mixing in the vertical direction, contributes to a reduction the concentrations of contaminants in the surface layer of the  atmosphere.                                       Using the monitoring data of the Hydrometeorological Center, significant features of weather conditions influence on air quality in Belarusian cities were revealed It was found that during the day the greatest concentrations of pollutants are most often registered in the morning and evening and much less in the afternoon Morning rise does not depend on the season and occurs at the same time, and the evening peak of the frequency of increased concentrations shifts to a later time of the day, moving from winter to summer.
     The diurnal variation of vertical stability of the atmosphere over the cities of Belarus shows, on average, insignificant differences throughout the country: stability is maximized at night, minimal in the afternoon and gradually increases from summer to winter. The diurnal variation of the climatic normal of wind speed shows features like the behavior of the maximum concentrations of pollutants: in the evening, the decrease in wind speed also shifts by the time of day depending on the season, and the morning increase is constant by time and does not depend on the season.
     However, traffic intensification in the daytime influenced on the appearance of the morning and evening peaks of the urban air pollution. Meteorological factors play an important role in the formation of these peaks, but not the main one.

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