SyPEP model was developed help farmers, extension services and regulating agencies by providing information on the environmental impact of pesticides. The indicator calculates a long-term PEC for groundwater, a short-term PEC for groundwater, and a PEC for surface water. It then divides toxicity information by the PEC in each environmental compartment. The resulting value in each of the three compartments is then ranked on a 0–5 scale to arrive at a SyPEP score (Pussemier, 1999; Pussemier and Steurbaut, 2004).


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