File:Biochemical oxygen demand in rivers, EU, 2000-2017 (mg O2 per litre).png
![File:Biochemical oxygen demand in rivers, EU, 2000-2017 (mg O2 per litre).png](/eurostat/statistics-explained/images/thumb/a/a4/Biochemical_oxygen_demand_in_rivers%2C_EU%2C_2000-2017_%28mg_O2_per_litre%29.png/800px-Biochemical_oxygen_demand_in_rivers%2C_EU%2C_2000-2017_%28mg_O2_per_litre%29.png)
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