Sound is a form of energy and can be pleasant and unpleasant acting as a source of annoyance and when in levels causing discomfort, is said to be noise pollution. The problem with sound is that the same sound can be relatively pleasing and annoying according to people’s preferences.
Any unwanted or unpleasant sound which is in the wrong place at the wrong time is noise pollution.
The decibel scale measures loudness. Noise of very high intensity levels can cause in severe cases, injury to the human ear.