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Discussion :: Environmental Engineering

  1. Maximum allowable concentration of CO2 in air for safe working is __________ ppm (parts per million).

    2. A.
    50
    B.
    1000
    C.
    2000
    D.
    5000

    View Answer

    Workspace

    View Answer

    Answer : Option D

    Explanation :

    No answer description available for this question.

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