Question

Define pollution
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Answer 1

The presence in environment of a substance which have harmful or poisonous effects

Answer 2

Pollution refers to the introduction of contaminants in the environment which can cause an adverse change.

The pollutants can be chemical or can also take form of different energies.

As you may known that there are various pollution in the environment  which are mainly air pollution, sound or noise pollution, water pollution light pollution, plastic pollution, soil contamination, radioactive pollution.