The average BOD has decreased since 1992 at the country level in Belarus, particularly in the period 1997-1998. For the whole time period 1986-2017 the BOD decreased by 19 % (comparing the average of the last three years to that of the first three years). The largest decrease was observed in the Western Bug river basin, followed by the Dniepr and Pripyat river basins, while there has hardly been any change overall in Western Dvina, the river basin with the lowest BOD levels.
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The average BOD has decreased since 1992 at the country level in Belarus, particularly in the period 1997-1998. For the whole time period 1986-2017 the BOD decreased by 19 % (comparing the average of the last three years to that of the first three years). The largest decrease was observed in the Neman and Dniepr river basins.