What is the allowed limit of asbestos in the air for the use of reusable or single air filtering respirators according to section 5208?

The correct answer reflects the regulatory standard set forth in section 5208 regarding permissible asbestos exposure levels for air quality when using reusable or single air filtering respirators. According to the regulations, the allowable concentration of asbestos fibers in the air for such respirators is indeed established as 10 times the permissible exposure limit (PEL).

This measure is significant as it provides a safety margin for workers who may be exposed to asbestos during their activities. The respirators are intended to protect users from inhaling harmful asbestos fibers, and the limit helps ensure that the protective equipment is effective. The choice of 10 times the limit indicates a recognition of the increased risk associated with asbestos exposure and aims to provide a high standard of health and safety for workers.

The other options suggest higher multipliers of the limit, which would not be compliant with the standards designed to protect workers from the risks associated with asbestos, indicating a lack of understanding of acceptable exposure levels outlined in the regulations.