Indicator of water pollutuon
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Composite indicator of organic pollution and nutrients includes: Dissolved oxygen: The dissolved oxygen content in natural water depends on the balance between water and atmospheric oxygen. ... But because of the growth of algae, dissolved oxygen may be too saturated.
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Biological oxygen demand is the indicator of water pollution ......it is the amount of oxygen required by aerobic bacteria to consume the organic matter present in the water body ...
So higher the bod more the water is polluted
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