Hazardous substances in mussels and oysters in Europe's seas

There is one map for each of the contaminants measured in mussels and oysters, which are representative of the hazardous substances in marine organisms. In the map, each of the small dots 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 arrow by each pie diagram shows whether concentrations are in general improving (decreasing concentrations) or show no significant change. There were no cases of increasing trends.