At a meeting, the committee, citing data by the Delhi Pollution Control Committee (DPCC), said that the biological oxygen demand (BOD) levels in the river measured at the ISBT Kashmere Gate ghat after the Najafgarh Drain meets the river showed that BOD dipped from 55 milligrams of oxygen per litre (mg/l) in May 2022 to 38mg/l in May 2023.
BOD is an indicator of pollution levels in water bodies and indicates the amount of oxygen required by aquatic life and organisms in the river in order to survive. The higher the BOD, the greater is this demand, which in turn means aquatic life is unlikely to survive. To be sure, BOD levels in a river should be 3mg/l or less, according to the Central Pollution Control Board standards.
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