Why is proper fitting of a respirator important?

Proper fitting of a respirator is crucial because it ensures a tight seal against the face, which is essential for effective protection from harmful airborne contaminants. If a respirator does not fit properly, it can allow unfiltered air to enter, negating its intended protective effects. This situation can expose the user to potentially hazardous substances, such as pesticides, dust, or other chemicals in the environment.

While other aspects like breathing ease and communication may have their significance, they do not directly impact the primary purpose of a respirator, which is to protect the wearer from inhaling harmful particles. An improper fit can lead to leaks and reduce the respirator's efficiency, making proper fit and seal a fundamental aspect of respiratory safety.