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    Question

    Which gas is primarily monitored to assess organic

    pollution in sewage and surface water?
    A CO Correct Answer Incorrect Answer
    B COā‚‚ Correct Answer Incorrect Answer
    C Oā‚‚ Correct Answer Incorrect Answer
    D Nā‚‚ Correct Answer Incorrect Answer

    Solution

    Dissolved oxygen (Oā‚‚) levels in water are critical for assessing organic pollution. The biochemical oxygen demand (BOD) test, which measures the amount of oxygen consumed by microorganisms in decomposing organic matter, is a key indicator of water quality and pollution levels.

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