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Sound that is unwanted or disrupts one’s quality of life is called as noise. So, Noise is basically any unwanted sound.
In this type of pollution contaminants are not physical particles, but waves which interfere with the naturally occurring waves of a similar type in the same environment.
When there is a lot of noise in the environment it is turned as noise pollution. Sound becomes undesirable when it disturb the normal activities such as working, sleeping etc.