Sound pollution is the disturbing or excessive noise. According to the UN, the normal tolerance limit of sound is 45 decibels. When the vibration of sound is at a tolerable, pleasant level, it is simply called sound. But when it is sharp and harsh to the ears, it becomes noise. It may harm the activity of human life. The source of most outdoor noise is mainly caused by machines and transportation systems, motor vehicles, aircraft and trains. Poor urban planning may give rise to sound pollution. Side-by-side industrial and residential buildings can result in noise pollution in the residential areas. The indoor noise is caused by machines, building activities, music performances, and especially in some workplaces. Noise pollution affects both health and behavior. Unwanted sound can damage psychological health. High noise levels can contribute to hearing loss, sleep disturbances, cardiovascular effects in humans, a rise in blood pressure coronary artery disease etc. Many developed countries are trying to control sound pollution by careful town planning and developing public awareness. In Holland schools are not allowed near airports and houses which are situated near airports are provided with special types of insulation to limit the sound heard inside the building.
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