Final answer:
Face piece dust mask respirators are subject to particulate matter and air pollution. They are designed to filter out harmful particles and pollutants in the air.
Step-by-step explanation:
Face piece dust mask respirators are subject to particulate matter and air pollution. These respirators are designed to filter out harmful particles and pollutants in the air to protect the respiratory system of the wearer. They are commonly used in industries where exposure to dust, smoke, and other airborne particles is a concern.