Hazardous substances in mussels and oysters in Europe's seas

The figure shows one map for each of the selected contaminants. Each of the small dots in the map represents a station (a location which is regularly monitored), coloured according to estimated concentration levels (low/moderate/high relative to environmental thresholds). The big pie diagrams show, for each region, the proportion of stations that have low/moderate/high concentration levels. The legend by each monitoring station shows whether the environmental status is improving (decreasing concentrations), deteriorating (increasing concentrations), shows no significant change (no trend) or no discernable trend (trend unknown).