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Freshwater environmental quality parameters are the natural and man-made chemical, biological and microbiological characteristics of rivers, lakes and ground-waters, the ways they are measured and the ways that they change. The values or concentrations attributed to such parameters can be used to describe the pollution status of an environment.
The water quality indicator developed for Yale and Columbia universities’ Environmental Performance Index (EPI) is a proximity-to-target composite of freshwater quality for lakes and rivers adjusted for monitoring stations’ density in each country. It has a possible maximum score of 100.
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