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Decrease in phosphate concentrate in European is less marked than for rivers, 80 % of the measurement stations show no change in phosphate concentrations. Significant decreases were observed at 13 % of stations in the Baltic, 28 % in the North Sea, and 5 % in the Mediterranean Sea (Figure 7.2b). In the Netherlands, phosphate concentrations showed a statistically significant decreasing trend at 15 of 20 stations. The improvements are attributed to implementation of urban wastewater treatment.