Heretsun H. Ecological safety of urbanized territories in conditions of technogenic transformation of atmospheric precipitation

In the dissertation research the scientific and practical task on establishment of features of formation of ecological danger of urbanized territories under the influence of technogenically-transformed sediments is solved. The methodology of qualitative and quantitative estimation of possible manifestations of ecological danger caused by atmospheric precipitation is proposed. The features of atmospheric precipitation as an object of environmental safety assessment are considered. Identification of sources of environmental hazard, which have an influence on the formation of precipitation composition. It is shown that due to emissions of mobile sources, the main amount of emissions of acid-forming compounds is formed. The analysis of data of monitoring of atmospheric precipitation is carried out. The transformation of the chemical composition has been established, which is accompanied by the redistribution of the number of basic ions and acidification of atmospheric precipitation. The formation of local cells of high pollution of atmospheric air, which causes the transformation of the chemical composition of precipitation, is revealed. Correlation dependencies between components are established. The kinetic regularities of washing of sulfates and nitrates are obtained. It is established that the most dangerous from the point of view of environmental safety are the first minutes of rain falls. The quantitative estimation of possible manifestations of ecological danger caused by atmospheric precipitation is proposed. The ecological hazard assessment scale has been developed. The estimation of levels and degrees of environmental hazard of atmospheric precipitation in Chernivtsi is carried out. Key words: ecological safety, atmospheric precipitation, pollution, chemical composition, urbanized area, technogenic transformation, pH index.