Table 5.12 - Descriptive statistics for annual mean organic matter and oxygen at European river stations

Source: Compiled by NERI and EEA-TF from multiple sources listed in Box 5E or referred to in the main text

 Number
of river
stations
Percentage of river stations
with organic matter and oxygen
concentrations (not
exceeding mg O2/l)
  Mean 10% 25% 50% 75% 90%
All rivers
BOD 645 4.5 1.4 1.9 2.8 4.7 7.9
COD 470 18.5 4.5 7.8 15.0 25.0 36.6
Oxygen 620 9.4 6.4 8.4 9.7 10.7 11.6
Near pristine rivers
BOD 11     1.2 1.6 2.7  
COD 23     5.1 13.3 29.9  
Oxygen 8     10.2 10.6 11.1  

Note: Guidance as how to read the table is given in Box 5E (Table 5.8).