how can water pollution be measured?

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Solution

Water pollution can be measured in three ways – physical, chemical and biological. Sample of water from polluted water bodies are collected and below mentioned tests are performed to determine whether water is polluted or not.

Physical tests: temperature, solid concentration etc. are measured.
Chemical test: measurement of pH, COD (chemical oxygen demand), nutrient content, presence of oil and grease, metal content etc. are measured.
Biological test: presence of animals, plants and microorganisms.

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