Table 4.

Prediction rates of reported EQS exceedances by modelled concentrations for 27 of the 36 substances, for which EQS exceedances are reported by Member States. For each priority substance, we show the share of total exceedances of both maximum acceptable concentration (MAC) and annual average (AA) EQS, falling within the 10%, 20% and 50% of highest concentration among EU rivers. For chemicals with IPChem samples available in the rivers with exceedances, we also show the share of exceedances corresponding to the highest 10%, 20% and 50% of measured concentrations. The table includes a qualitative judgment of the model prediction rate performance (H = high, L = low, M = medium, M/H, M/L is for intermediate performance).