Environmental noise is the summary of noise pollution from outside, caused by transport, industrial and recreational activities.
Noise is frequently described as 'unwanted sound', and within this context, environmental noise is generally present in some form in all areas of human activity.
Noise at low level is not necessarily harmful, however, the adverse effects of noise exposure could include interference with speech, sleep disturbance, anxiety, hearing damage and stress-related cardiovascular health problems. As a result, environmental noise is studied, regulated and monitored by many governments and institutions.

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