4a.
When identifying river basin specific pollutants for which it could be necessary to set EQS at Union level, the Commission shall take into account the following criteria: the risk posed by the pollutants, including their hazard, their environmental concentrations and the concentration above which effects might be expected, as well as possible cumulative effects; the disparity between the national EQS set for river basin specific pollutants by different Member States and the degree to which such disparity is justifiable; the number of Member States already implementing EQS for the river basin specific pollutants under consideration.
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Source: EUR-Lex CELLAR · retrieved 2026-08-09 · Text as consolidated on 2026-05-10; changes after this date are not shown.