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.
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Car-pooling with your colleagues will lessen your impact on the environment, save you money and let you travel in the company of others. Ask which of your colleagues live nearby and take turns driving to work.
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