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Approaches used to set nutrient threshold values for different water categories.
1 - regression between nutrient and biological response, 2 - modelling, 3 - distribution of nutrient concentrations in water bodies classified (using ecological criteria); 4 - distribution of nutrient concentrations in all water bodies using an arbitrary percentile, 5 - expert judgement, 6 - OSPAR (2013) approach, 7 – insufficient information. For details, see Section 2.3.
