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Only 6 % of river sites in Belarus had current BOD above the lowest national maximum permissible concentration (3 mg O2/l). The average BOD level was relatively similar among the different river basins. The situation was worse for ammonium concentration, with 67 % of the sites in the upper two concentration classes. The highest average BOD concentration was found in the Pripyat and Dnieper basins. In Belarus, 25 % of the sites had ammonium concentration above the national maximum permissible concentration (0.39 mg NH4-N/l), but this level is quite high compared to EU Fish Directive recommended levels. 82 % of the sites were above the recommended BOD level for cyprinid fish.
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Only 6 % of river sites in Belarus had current BOD above the lowest national maximum permissible concentration (3 mg O2/l or 6 mg O2/l). The average BOD level was relatively similar among the different river basins. The highest average BOD concentration was found in the Western Bug and Dnieper basins. In Belarus, 25 % of the sites had ammonium concentration above the national maximum permissible concentration (0.39 mg NH4-N/l), but at present, average annual ammonium concentration complies with national quality standard.