When can it be said that the level of polluti | vedclass

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(C) $BOD$ stands for Biochemical Oxygen Demand. It refers to the amount of oxygen that would be consumed if all the organic matter in one liter of wat

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When the $BOD$ value in water is high.

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(C) $BOD$ stands for Biochemical Oxygen Demand. It refers to the amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria. Micro-organisms consume oxygen during the decomposition of organic waste. Therefore,if the water is highly polluted with organic matter,the bacteria will consume more oxygen to break it down,leading to a higher $BOD$ value. Thus,a high $BOD$ value is a direct indicator of high water pollution.

When can it be said that the level of pollution in water is high?

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