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

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1.	TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm.
A.	0.1
B.	25
C.	100
D.	1000
Answer» B. 25

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