Which type of respirator must be used when exposed to high concentrations of particulates?

When exposed to high concentrations of particulates, a supplied-air respirator is essential because it provides a continuous supply of clean air from a designated source, ensuring that the user receives adequate respiratory protection even in environments with hazardous pollutant levels. This type of respirator is particularly vital in situations where the contaminant concentration exceeds the limits that can be effectively filtered out by air-purifying respirators.

Supplied-air respirators are suitable for high-risk environments such as confined spaces or areas with heavy airborne contaminants, offering a higher level of safety than other options, which may not be effective under those conditions. By delivering fresh air directly to the respirator wearer, it mitigates the risks of inhaling harmful particulates, thereby enhancing overall worker safety in hazardous contexts.