Why is the fit of a respirator important during pesticide application?

The fit of a respirator is crucial during pesticide application primarily to prevent inhalation exposure. A well-fitted respirator creates a tight seal against the face, ensuring that air being breathed in passes through the filter rather than around it. This is vital when handling pesticides, as improper fit could allow harmful airborne particles or gases to enter the breathing zone, leading to serious health risks.

While comfort during long hours of use and aesthetic considerations can be factors in selecting a respirator, they do not address the primary safety concern. Noise reduction is typically not a relevant feature of respirators within the context of pesticide application, making the prevention of inhalation exposure the most critical reason for ensuring a proper fit.