Threshold Limit Value-Time Weighted Average (TLV-TWA) for occupational exposure to a chemical represents the concentration that:
- A Causes immediate danger to life if exceeded for any duration
- B Should not be exceeded even momentarily during the workday
- C A healthy worker can be exposed to for an 8-hour workday, 5 days a week, without adverse effects ✓
- D Is the maximum allowable concentration for 15-minute short-term exposures
Correct answer: C. A healthy worker can be exposed to for an 8-hour workday, 5 days a week, without adverse effects
Explanation
TLV-TWA is the time-weighted average concentration for a conventional 8-hour workday and 40-hour work week, below which nearly all workers may be exposed repeatedly without adverse health effects. TLV-STEL (Short-Term Exposure Limit) is the 15-minute exposure ceiling. TLV-Ceiling (C) is the concentration that should never be exceeded even instantaneously. IDLH (Immediately Dangerous to Life and Health) is the level requiring immediate escape.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.