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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New supermarkets in the area can reduce business for smaller shops. Pollution and congestion would be significantly less if consumers frequented their local shops, rather than travelling long distances to out-of-town shopping centres.
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