To measure the pollution of a particular river, one must take the sample of the river and take the sample of pure water, then draw the conclusion, it will tell the amount of pollution in the river water.
Pollution is the mixing of unwanted or harmful things in any substance or compound.
Water pollution is the mixing of toxics and chemicals in water.
Thus, to measure the pollution of a particular river, one must take the sample of the river and take the sample of pure water, then draw the conclusion, it will tell the amount of pollution in the river water.
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