Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe li

Question

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.

Options:

A . 5

B . 500

C . 1000

D . 2000

Answer: Option A
Answer: (a).5

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