Percentage of river stations per country with significant increasing, stable or decreasing BOD trend between 1992 and 2006

Figure Created 12 Nov 2009 Published 12 Nov 2009 Last modified 29 Nov 2012
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Number of river monitoring stations included in analysis noted in brackets


European data


Additional information

BOD5 data used for all countries except Estonia (EE) and Finland (FI) where only BOD7 data used. BOD7 data from Lithuania (LT) (1996-2006) and Latvia (LV) (1996-2001) have been recalculated into BOD5 data. Time series trends calculated, using only stations that have recorded concentrations for at least seven of the years included in the time series. Sen''s Test then applied to determine statistically significant trends in the data (see Methodology section for further details).

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