The Threshold Limit Value-Short Term Exposure Limit (TLV-STEL) for a chemical refers to:
- A Maximum 8-hour Time-Weighted Average concentration
- B Maximum concentration permissible for 15-minute continuous exposure not more than 4 times daily ✓
- C Concentration that is immediately dangerous to life and health
- D Concentration at which 50% of the population shows adverse effects
Correct answer: B. Maximum concentration permissible for 15-minute continuous exposure not more than 4 times daily
Explanation
TLV-STEL is the concentration to which workers can be exposed for a short-term period (15 minutes) without suffering irritation, chronic tissue damage, or narcosis, provided the TLV-TWA is not exceeded. Short-term exposures exceeding STEL should not occur more than 4 times per day with at least 60 minutes between exposures. TLV-C is the ceiling limit (never exceeded); TLV-TWA is the 8-hour average.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
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