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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.

    2. A.
    5
    B.
    500
    C.
    1000
    D.
    2000

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    Answer : Option A

    Explanation :

    No answer description available for this question.

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