"DEFINITION OF NOISE POLLUTION'

*NOISE POLLUTION*

Noise pollution or noise disturbance is the disturbing or excessive noise that may harm the activity or balance of human or animal life. The source of most outdoor noise worldwide is mainly caused bymachines and transportation systems, motor vehicles, aircraft, andtrains. Outdoor noise is summarized by the word environmental noise. Poor urban planning may give rise to noise pollution, since side-by-side industrial and residential buildings can result in noise pollution in the residential areas. Documented problems associated with urban noise go back as far as Ancient Rome.^[3]

Outdoor noise can be caused by machines, building activities, and music performances, especially in some workplaces. Noise-induced hearing loss can be caused by outside (ex:train) or inside (ex: music) noise.

High noise levels can contribute to cardiovascular effects in humans and an increased incidence of coronary artery disease.In animals, noise can increase the risk of death by altering predator or prey detection and avoidance, interfere with reproduction and navigation, and contribute to permanent hearing loss

Noise pollution is undesired sound that is disruptive or dangerous and can cause harm to life, nature, and property. It is often said that noise differs from other forms of pollution in that, unlike atmospheric pollutants for example, once abated, noise leaves no residual accumulation in the environment or the human body. Noise does leave behind its effects, however, and these can deteriorate after continued exposure to harmful sounds. So it is not true, strictly speaking, that “noise … leaves no visible evidence”

The noise pollution is defined as the unwanted sound which is released into the environment. It disturbs the human being and cause an adverse effect on the mental and psychological well being. It is measured in the units of decibels and is denoted by the dB. The noise which is more than 115 dB is tolerant. The industrial limit of sound in the industries must be 75 dB according to the world health organization. A type writer can produce a sound at 60 dB. There are different sources of the noise pollution and include the agriculture machines, industries which produce a sound and the use of entertaining equipment, crackers, the blasting of dynamite, bull dozing, stone crushing, defense equipments and textile mills. loud or unpleasant noise that is caused by automobiles, airplanes, etc., and that is harmful or annoying to the people who can hear it.