Engineering controls for handling pesticides include ______________.

Engineering controls for handling pesticides primarily aim to reduce exposure to harmful substances by incorporating technology and design features into the pesticide application process. Closed mixing systems are specifically designed to minimize the risk of exposure to the pesticide by creating a sealed environment for mixing and transferring chemicals. This means that the operator is not exposed to the hazardous substances during the mixing process, thereby enhancing safety measures.

In contrast, water retention basins, wheel-move sprinklers, and global positioning units serve other purposes. Water retention basins are utilized for managing water resources and minimizing runoff, which may be environmentally beneficial but do not contribute directly to reducing personal exposure to pesticides. Wheel-move sprinklers focus on efficiently applying water or certain nutrient solutions, while global positioning units assist with navigation or precision agriculture but do not directly impact the safety concerning handling pesticides.

Thus, the focus on closed mixing systems reflects a direct application of engineering controls that enhance safety and health standards when dealing with pesticides.