Concentrations are expressed as the average of annual mean concentrations. Up to 3-year gaps of missing values have been interpolated or extrapolated. Only complete series with no missing values after this interpolation/extrapolation are included. The number of river monitoring stations included in the analysis per geographic region is noted in brackets. BOD7 data (Estonia, Finland, Lithuania (1996-2008), Latvia (1996-2001)) has been recalculated into BOD5 data.
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Eastern Europe (363): CZ (70), HU (98), EE (53), LT (28), LV (39), SI (22), SK (53); Northern Europe (23): FI (23); Southern Europe (227): ES (227); Southeastern Europe (103): AL (9), BG (85), MK (9); Western Europe (550): AT (145), BE (26), DK (35), FR (306), GB (29), IE (6), LU (3).