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. Number of river monitoring stations included in analysis per country and region is noted in brackets.
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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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