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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Home gardens can add immensely to the biodiversity of cities and towns.
They provide cover, feeding and commuting routes for wildlife including hedgehogs, badgers, birds and butterflies. If you have a garden, increase its value by planting berry-bearing trees and flowering plants. Rowan, bird cherry and dandelion, among others, can serve as food and shelter to a wide range of invertebrates.
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