PEL values for asbestos are expressed in fibers per cubic centimeter.

• A. False
• B. Not specified
• C. True
• D. Meters

Answer: (C)

The key idea is that exposure limits for airborne hazards are expressed as how many fibers are present in a given volume of air. For asbestos, the permissible exposure limit is reported as fibers per cubic centimeter (f/cc) of air. This makes sense because risk comes from inhaling fibers, so measuring concentration in air directly reflects potential exposure. Air samples are collected and analyzed under a microscope, counting asbestos fibers per cubic centimeter to determine compliance with the limit (often an eight-hour time-weighted average). While other units like meters measure length, they do not represent concentration in air, and “not specified” isn’t accurate because the established unit for asbestos PELs is f/cc. So statement is true.