Maybe no chemical is needed at all. For example, mowing weeds eliminates the need to use toxic sprays to kill weeds. Injuries from lifting heavy objects can be reduced by buying goods in smaller containers. There are many types of devices that make work safer. Ventilation is a good way to get rid of harmful substances in the air.
General ventilation is meant for a large area such as a building s air handling system.
Local ventilation is designed for a small area or specific operation like a fume hood or biological safety cabinet. See Figure 1. Patient lifting devices reduce the strain on workers backs and limbs from lifting and moving patients. See Figure 2. Needles that retract or are sheathed after use protect workers from getting stuck by infected needles.