What must employers provide when employees are potentially exposed to hazardous substances?

Employers are required to provide respirators when employees are potentially exposed to hazardous substances due to the nature of these substances and their potential health impacts. Respirators serve as a crucial form of personal protective equipment (PPE) designed to protect workers from inhaling harmful contaminants, including dust, fumes, vapors, and gases that could lead to serious respiratory issues or other health hazards.

The provision of respirators is particularly important in environments where the air quality is compromised or where exposure levels exceed established occupational exposure limits. Ensuring that employees have access to proper respiratory protection aligns with regulations and safety standards aimed at minimizing health risks associated with exposure to hazardous materials.

In contrast, the other options, while they may also be important protective gear in various contexts, are not specifically required in every scenario involving hazardous substances. For example, face shields and protective clothing may be relevant for certain types of exposures and specific jobs, but respirators are essential in addressing airborne hazards directly, making them the primary requirement when dealing with potentially hazardous substances.