Notes, figure 2:
Kosovo* refers to Kosovo under UNSC Resolution 1244/99.
The current concentration per river site is calculated as the average of available annual mean concentrations for the years 2018-2020. Concentrations are in mg nitrate-nitrogen per litre (mg NO3-N/l).
The river sites are assigned to different concentration classes to visualise the distribution of data in the dataset. 11.3 mg NO3-N/l corresponds to the maximum allowable concentration for nitrate of 50 mg/l in the Drinking Water Directive (2020/2184). The number of river sites per country is given in parenthesis.
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PT - In the document it is not clear how the classes in figure 2 were established.
For a quicker analysis the units should be the same of the Directives, i.e. Nitrates Directive in mg/l NO3.