Threshold Limit Value (TLV) is the maximum allowable concentration (i. – McqOptions

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1.	Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.
A.	5
B.	500
C.	1000
D.	2000
Answer» B. 500

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