Modelling of atmospheric transport and deposition of pesticides

Modelling of atmospheric transport and deposition of pesticides is presente d and discussed. Modelling on regional scale builds on the existing knowled ge gained in other air pollution fields. An overview of current modelling s tudies on transport and deposition on a regional scale (typically 30-3000 k m) is given. From these studies it is concluded that the models are capable in simulating the spatial distribution of the concentrations and depositio ns. However, large uncertainties are present in this type of modelling and are for the greater part induced by the uncertainty in the emissions and su bsequently in the exchange process parameterisations and the physicochemica l properties needed in the parameterisations. Many more measurement data ar e needed to validate the models.