Threshold limit value (TLV) of CO in air is _____________ ppm?
Correct answer: B. 50
- A. 5
- B. 50
- C. 2000
- D. 5000
Explanation
The commonly specified threshold limit value for carbon monoxide exposure is 50 ppm. CO is hazardous because it binds strongly with haemoglobin and interferes with oxygen transport.
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