Nutrient trends in European water bodies

Note: The data series are calculated as the average of annual mean concentrations for groundwater bodies, river stations and lake stations in Europe. Only complete series after inter/extrapolation are included (see indicator specification).
The number of groundwater bodies included per country is given in parentheses:
1992-2018:  Europe (542), Austria (13), Belgium (20), Bulgaria (24), Denmark (84), Estonia (17), Finland** (8), France (248), Germany (66), Ireland (51), Portugal (2), Slovakia (4), Slovenia (5).
2000-2018:  Europe (1077), Austria (14), Belgium (34), Bulgaria (40), Cyprus (5), Czechia (64), Denmark (89), Estonia (20), Finland** (9), France (441), Germany (175), Ireland (68), Malta (2), Portugal (10), Serbia (21), Slovakia (16), Slovenia (6), Spain (26), Switzerland (37).

(*all data total oxidised nitrogen, **some data total oxidised nitrogen)