Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about ______________ ppm (parts per million)?
Correct answer: B. 0.2
- A. 0.002
- B. 0.2
- C. 1.2
- D. 4.8
Explanation
Phosgene is extremely toxic, so its TLV is very low, about 0.2 ppm in the convention used by this question. Values such as 1.2 and 4.8 ppm would represent dangerous exposures rather than acceptable limits.
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