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Data Visualization
Methodology:
The river monitoring sites are assigned to different concentration classes. The number of river monitoring sites per country is given in parenthesis.
Sweden, with BOD data for only two sites, is excluded from the chart since the sites may not be representative for the whole country.
For references, please go to https://www.eea.europa.eu/data-and-maps/daviz/data-visualizationstatus-of-biochemical-oxygen or scan the QR code.
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