Trends in Biochemical Oxygen demand and ammonium in European rivers

Note: Concentrations are expressed as annual mean concentrations. Only complete series after inter/extrapolation are included (see indicator specification). Two time series are depicted — the longer time series with fewer stations and the shorter time series with more stations. The number of river monitoring stations included per country is given in parenthesis. BOD7 data have been recalculated into BOD5 data.
1992-2018: Europe (506), Albania (4), Austria (44), Belgium (26), Bulgaria (58), Czechia (19), Estonia (38), Finland (5), France (156), Ireland (3), Latvia (10), Lithuania (23), North Macedonia (1), Slovakia (8), Slovenia (8), Spain (79), Sweden (1), United Kingdom (23).
2000-2018: Europe (977), Albania (5), Austria (46), Belgium (36), Bulgaria (75), Croatia (22), Cyprus (4), Czechia (19), Estonia (40), Finland (5), France (211), Ireland (51), Latvia (14), Lithuania (23), North Macedonia (4), Poland (68), Romania (101), Serbia (34), Slovakia (8), Slovenia (10), Spain (175), Sweden (1), United Kingdom (25).