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).
Did you know that most of oil pollution in our oceans is the result of human activity on land and not tanker spills? If you notice oil leaking from your car, fix it right away! Never dispose of used oil into a storm drain.
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