Table 5.15 - Descriptive statistics of annual mean nitrogen concentrations in European rivers

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 concentrations not
exceeding (mg N/l)
  Mean 10% 25% 50% 75% 90%
All rivers
Total nitrogen 329 3.34 0.30 0.80 2.12 4.50 7.32
Nitrate 654 2.63 0.24 0.70 1.80 3.90 5.73
Ammonium 580 0.66 0.03 0.07 0.18 0.45 1.40
Near pristine rivers
Total nitrogen 43 0.40   0.19 0.33 0.39  
Nitrate 39 0.30   0.05 0.10 0.22  

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