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  1. 'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the

    2. A.
    industrial chimney exhaust.
    B.
    automobiles exhaust.
    C.
    photochemical reaction in polluted atmosphere.
    D.
    burning of domestic fuel.

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    Answer : Option B

    Explanation :

    No answer description available for this question.

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