Which is NOT listed as a TLV attribute?

• A. Exposure limits
• B. Molecular weight
• C. Carcinogens
• D. Public health advisories

Answer: (B)

Threshold Limit Values are exposure-based guidelines that describe how much of a chemical a worker can be exposed to and for how long, along with notes that help classify hazards. The attributes tied to TLVs typically include exposure limits (like time-weighted averages or short-term limits), hazard classifications such as carcinogenic status, and accompanying public health advisories that provide context for safe use and monitoring.

Molecular weight, on the other hand, is a fundamental property of a chemical that describes its mass, not a guideline or hazard descriptor used to set or interpret TLVs. It doesn’t convey safe exposure information or hazard guidance, so it isn’t listed as a TLV attribute.