Which workers are required to wear respirators according to OSHA guidelines?

The requirement for workers to wear respirators according to OSHA guidelines is primarily based on exposure levels to airborne contaminants, specifically asbestos. The permissible exposure limit (PEL) is the maximum concentration of a hazardous substance, such as asbestos, that workers can be exposed to during an 8-hour workday.

When workers are exposed to asbestos at or above this specified PEL, respirators become a necessary form of protective equipment to prevent inhalation of harmful fibers. This requirement is driven by the need to ensure worker safety and health in environments where asbestos exposure may occur.

The guidelines are specific to those individuals who might be working in an environment where exposure exceeds safe levels. Therefore, while it may seem prudent for all workers to wear respirators, it's particularly crucial for those exposed to harmful concentrations, as this approach aligns with safety regulations and best practices in occupational health.