Within the framework of an application for registration of an agrochemical, computer simulations are used to obtain an estimate of the amount of substance that might enter the environment.
Substance concentrations are usually simulated for the environmental compartments soil, groundwater and surface water. Depending on the characteristics of the substance, calculation of concentration in air is considered as well.
Here, various approaches must be considered, including those applied at EU-level (e.g. FOCUS, EFSA), at individual Member State level, as well as those used by regulatory authorities outside the EU.
Higher-tier modelling studies and spatial approaches based on Geographical Information Systems (GIS) strengthen the environmental exposure assessment by adding more complexity in the sense of bringing the simulated processes closer to realistic environmental conditions.
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