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In spite of measures to reduce nutrient concentrations in European seas, 85 % of measurement stations show no change in nitrogen concentrations, 80 % show no change in phosphorous concentrations (see Fig. 7.2b), and 89 % show no change in chlorophyll-a concentrations.

Winter oxidized nitrogen concentrations have fallen significantly at 21 % of 268 stations in the Baltic Sea and at 8 % of stations in the North Sea. The stations with decreasing trends are in Denmark, Finland, Germany, the Netherlands, Norway and Sweden, and in the open parts of the Baltic Sea (Figure 4.1). Little improvement is seen in other seas (EEA, 2010d).