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 (see indicator specification). The number of river monitoring stations included in the analysis per geographic region is noted in brackets.
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If needed use cling film and paper instead of aluminium foil when you prepare your lunch. Reducing the amount of materials you use will reduce the amount of rubbish you throw away and this is good news for the environment!
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