Monitoring of Transboundary Pollutant Transport with River Water from the Russian Federation to the Republic of Belarus in 2010–2020 and Its Results

The article presents results of monitoring the transboundary transport of pollutants with river water of the Western Dvina River and the Dnieper River basins for the period from 2010 to 2020. The impact of water runoff long-term dynamics on the transboundary surface water quality is discussed. The assessment of the excess transport of pollutants is given, taking into account differences in the values of standard concentrations adopted on the territory of the Russian Federation and the Republic of Belarus. There is an analysis of the differences between the concentrations of substances at the observation stations opened on the border with the Republic of Belarus in 2013–2016 (the Western Dvina in Verkhov’e village; the Dnieper in Khlystovka village, and the Sozh River in Bakharevka village) and at the observation stations away from the border (the Western Dvina in the town of Velizh; the Dnieper in the city of Smolensk, and the Sozh in Khislavichi urban-type settlement) in the paper. The pollution of the catchments with various substances is characterized, and priority indicators that help to recommend some measures to reduce the contamination of catchments with them are identified.