File:Biochemical oxygen demand in rivers, by country, 2009 and 2014 (mg O₂ per litre).png
![File:Biochemical oxygen demand in rivers, by country, 2009 and 2014 (mg O₂ per litre).png](/eurostat/statistics-explained/images/thumb/1/1f/Biochemical_oxygen_demand_in_rivers%2C_by_country%2C_2009_and_2014_%28mg_O%E2%82%82_per_litre%29.png/800px-Biochemical_oxygen_demand_in_rivers%2C_by_country%2C_2009_and_2014_%28mg_O%E2%82%82_per_litre%29.png)
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