Final answer:
A respirator should be used when exposed to high concentrations of pesticide in enclosed areas.
Step-by-step explanation:
True.
Respirators should be used when exposed to high concentrations of pesticides in enclosed areas. This is because inhalation of pesticide fumes can lead to pesticide illnesses, and enclosed areas with poor ventilation systems can further increase the risk of exposure. Examples of enclosed areas where respiratory protection is important include greenhouse spraying operations, tractor cabs, and facilities or locations with inadequate ventilation.