The sea region data series are calculated as the average of annual mean concentrations for river monitoring stations in each sea region. The data thus represents rivers or river basins draining into that particular sea. Only complete series after inter/extrapolation are included (see indicator specification). The number of river monitoring stations per sea region is given in parentheses.
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Walk or cycle to your work as much as it is possible and you’ll set your kids a good example. Encourage them to walk, cycle or take the bus when going to and from school each day! Both their health and the environment will benefit.
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