Exposure to paraquat from spray dri

Exposure to paraquat from spray drift may occur in windy weather, though field studies suggest that the airborne paraquat concentration declines markedly within a few metres of the sprayed area (section 4.3.3). Because of the rapid and complete binding of paraquat to clay particles in the soil, contamination of water supplies either from field runoff or percolation through soil to the water table is not an environmental problem (sections 4.3.1 and 4.3.2). Paraquat has also been shown not to have any harmful effects on birds (sections 5.3 and 5.4).