It should be noted that the lack of consistent or reliable data from the marine conventions or EEA counties inhibits adequate assessment of concentrations and trends of hazardous substances in European marine water
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Aggregated data do not necessarily convey the uncertainty these problems cause. A minimum of 3 herring stations were used. Comparisons are based on average of yearly regional and adjusted medians for the indicated time periods. Geographical coverage note: Nort-east Atlantic Ocean, Baltic Sea