Concentrations are expressed as the average of annual mean concentrations. Up to 3-year gaps of missing values have been interpolated or extrapolated. Only complete series with no missing values after this interpolation/extrapolation are included (see indicator specificatios). The number of river monitoring stations included in the analysis per sea region is noted in brackets.
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Arctic Ocean (13): FI (10), NO (3); Baltic Sea (368): DE (11), EE (53), FI (76), LT (27), LV (23), PL (103), SE (75); Black Sea (297): AT (133), BG (39), DE (17), HU (95), PL (2), SI (11); Celtic Seas, Bay of Biscay, Iberian Coast (201): ES (117), FR (75), IE (4), UK (5); Greater North Sea (247): AT (11), BE (29), DE (117), FR (35), LU (3), NO (7), SE (38), UK (7); Mediterranean Sea (184): AL (8), BG (39), ES (68), FR (56), MK (9), SI (4).