Concentrations are expressed as a median of annual mean concentrations. Up to three-year gaps of missing values have been interpolated or extrapolated. Only complete series with no missing values after this interpolation/extrapolation are included. The number of time series/river stations is shown in parentheses. The trend for 1992 to 2010 for each of the ecological quality classes has been linearly extended to 2027 — or when the concentration level becomes negative.
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Appreciate wildlife, but be sure to watch wild animals from a distance and avoid feeding them. Remember, the scent you leave when you touch a nest or a lair may scare the parents off for good. Instead of touching, try to find out more about them and maybe even discover how you can contribute to their protection.
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