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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 CO₂ Correct Answer Incorrect Answer
    C O₂ Correct Answer Incorrect Answer
    D N₂ Correct Answer Incorrect Answer

    Solution

    Dissolved oxygen (O₂) 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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