TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

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TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

Options:

A . 0.1

B . 25

C . 100

D . 1000

Answer: Option A
Answer: (a).0.1

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