Biochemical oxygen demand and ammonium in European Rivers

Methodology

The data series are calculated as the average of annual mean concentrations for river sites in Europe. Only complete time series after inter/extrapolation are included (see indicator's "Methodology" section).

Left chart:
BOD7 data has been recalculated into BOD5 data.

Units

Left chart: mgO₂/l
Right chart: µgNH₄-N/l

Additional information

Two time series are shown – a longer time series representing fewer water bodies and a shorter time series representing more water bodies.

Left chart:
Biochemical oxygen demand (BOD) in rivers: The number of river monitoring sites included per country is given in parenthesis:
1992-2021: Albania (4), Austria (1), Belgium (26), Bulgaria (56), Czechia (22), Estonia (33), Finland (5), Ireland (3), Latvia (13), Lithuania (22), North Macedonia (4), Slovakia (8), Slovenia (8), Spain (78), Sweden (1).
2000-2021: Albania (5), Austria (1), Belgium (36), Bulgaria (73), Croatia (23), Cyprus (4), Czechia (22), Estonia (35), Finland (5), Ireland (14), Italy (44), Latvia (16), Lithuania (22), North Macedonia (8), Poland (90), Romania (88), Serbia (33), Slovakia (8), Slovenia (10), Spain (177), Sweden (1).

Right chart:
Ammonium in rivers: The number of reported river monitoring sites per country is given in parenthesis:
1992-2021: Albania (4), Austria (1), Belgium (20), Bulgaria (38), Estonia (35), Finland (59), Germany (119), Ireland (4), Latvia (12), Lithuania (22), North Macedonia (5), Norway (26), Slovenia (7), Spain (22), Sweden (110).
2000-2021: Albania (8), Austria (1), Belgium (23), Bulgaria (56), Croatia (23), Estonia (37), Finland (68), Germany (122), Iceland (1), Ireland (28), Italy (25), Latvia (15), Lithuania (22), North Macedonia (17), Norway (26), Poland (4), Romania (89), Serbia (33), Slovenia (8), Spain (55), Sweden (112).