The results of a study of the nature of the occurrence of fine dust particles in the urban environment (on the example of the city of Volgograd) are presented. The sources of dust release in the form of ground dispersed massifs represented by loess and clayey soils are considered. The results of determining the mode of variability of the parameters of the mechanical composition, physical properties in two directions of dust drift (southeast and north) are shown. Studies of loess and clayey rocks for radon content were carried out. It was revealed that the dispersed soils under consideration are characterized by significant indicators of the effective specific activity of radon. Researches of pollution of a snow cover are carried out. It was found that the snow cover, in addition to technogenic accumulations, contains particles of fine dust. The results of the study will help in the implementation of predictive assessments of possible changes in the environment.

Keywords: atmospheric pollution, fine dust, urban environment, dispersed rock, wind flow, soil massif, radon content, drift trend of fine earth