TLV of ozone (O3) and phosgene (COCl2) in air is _______________ ppm?
Correct answer: A. 0.1
- A. 0.1
- B. 25
- C. 100
- D. 1000
Explanation
The threshold limit value for both ozone and phosgene is about 0.1 ppm because both are highly toxic inhalation hazards. Values such as 25 ppm are associated with less toxic atmospheric contaminants, not these gases.
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