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How are the pollutants categorized on the basis of their existence in nature. Give two examples of each category? |
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Answer» Pollutants are categorizes in mainly i.e. degradable and non- degradable pollutants, out of them non-degradable pollutants create the problem of pollution, e.g. glass, plastics, pesticides etc. On the basis of existence in nature, pollutants are divided into two categories: (i) Quantitative pollutants: These substances exist in nature but they act as pollutants when their concentration or quantity increases up to a critical level in the atmosphere, e.g., Carbon- dioxide, Nitrogen oxide, etc. (ii) Qualitative pollutants: These pollutants do not exist in the environment They are introduced into the environment through man’s activities, e.g., pesticides (DDT), chemical fertilizers, herbicides etc. |
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