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Concentration levels of ammonium have been more variable in Belarus, but there has been a steady decrease since 1998. This is also seen in the different river basins, however, all except Western Dvina experienced a sharp increase in 1998. This is in contrast to the marked decrease in BOD in the same period and may partly indicate different sources of pollution. However, the decreasing levels in both parameters –ammonium in particular –over the last two decades, indicates an overall reduction in pressure from organic pollution.
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Concentration levels of ammonium have been more variable in Belarus, but there has been a steady decrease since 1998. This is also seen in the different river basins, however, all except Western Dvina experienced a sharp increase in 1992-1998. This is in contrast to the marked decrease in BOD in the same period and may partly indicate different sources of pollution. However, the decreasing levels in both parameters –ammonium in particular –over the last two decades, indicates an overall reduction in pressure from organic pollution.