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 (1996-2009), Latvia (1996-2001)) has been recalculated into BOD5 data.
EEA standard re-use policy: unless otherwise indicated, re-use of content on the EEA website for commercial or non-commercial purposes is permitted free of charge, provided that the source is acknowledged (http://www.eea.europa.eu/legal/copyright). Copyright holder: European Environment Agency (EEA).
Keep your dog on a lead if it is likely to run off and disturb wildlife.
In particular, be careful of nesting birds in early spring and early summer, and roosting or feeding birds in winter. If you have a dog, keep this in mind when you're taking it for a walk!
More green tips