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Wednesday, September 19, 2018

Noise Pollution

  
  The normal range of hearing is 20Hz to 20KHz.  When we talk in decibel unit it is 60db for average speech. The maximum sound of 140db can be hearable by a young man how ever long period of time may harm.  For the children it is 120db beyond that several health effects seen. "Experiments have shown that a healthy young person hears all sound frequencies from approximately 20 to 20,000 hertz." "The maximum range of human hearing includes sound frequencies from about 15 to about 18,000 waves, or cycles, per second." "The general range of hearing for young people is 20 Hz to 20 kHz."


Pollution of Sound                                           

It means unwanted sound that can have deleterious effects on human health and environmental quality. It is commonly generated inside many industrial facilities and some other workplaces, but it also comes from highway, railway, and airplane traffic and from outdoor construction activities. It has become a serious problem for human health. The noisy atmosphere in which we are living is an obstacle in securing good health. Noise pollution and environmental noise are hurting human and other organisms. Noise beyond a limit produces many diseases, such as hypertension, stress, making people vulnerable to forgetfulness, depression and many other serious ailments. Noise is also very dangerous for nature as a whole because it disturbs the tranquillity of all creatures and increases mortality rate in them. Noise pollution is dependent on the loudness and frequency of the sound. In facts, when the sound exceeds its limit, it become fatal for human and other organisms.

The sources of noise pollutions are divided into two categories:

Natural sources

The natural environment is filled with various sounds- thunderstorm, lightning, tornado, cyclone, volcanic eruption, earthquakes, landslides, sounds produced by animals, and rapidly falling water.

Human sources

Rapid industrialization, urbanisation, use of modern means of transport, population growth, and increasing scale of human activities are some of the human factors responsible for noise pollution, Both types of noise pollution, affect sleep, listening ability, physical and mental health.
Low, Soft,  high medium sound waves

Vehicular noise: The modern means of traffic including vehicles such as buses, trucks, scooters, cars etc. pollute the atmosphere. Sound of other automated vehicles and horn, excessive use of loudspeakers for religious purposes also generate jarring noise.
Industrial noise: Industry- businesses, factories and commercial establishments produced a variety of harsh sounds that bump into our ears and disturb our mind. Noise pollution is an integral part of the industrial environment with heavy machines used in the industries; it is on the rise with the increase in industrial urbanisation.
Fireworks: It is another source of pollution. Uncontrolled fireworks in festivals, fairs, or crackers, after victory in matches and elections produce unbearable noise.
Some reasons are also for that inside and outside the house includes car alarms, emergency service siren, machine tools, compressed air horn, equipment, electrical equipment, megaphone etc.

Effect  

  • Physical effects: The physical manifestation of noise pollution is the effect on hearing ability. Repeated exposure to noise may result in temporary or permanent shifting of the hearing threshold of a person depending upon the level and duration of exposure.
  • Physiological effects: Headache bye dilating blood vessels of the brain.
  • Increase in the rate of heart beat.
  • Narrowing of arteries.
  • Pain in the heart.
  • Migration patterns of birds are disturbed, due to which their population is decreasing.

Remedies

  • Automobile servicing 
  • Tree plantation
  • Soundproof homes
  • Factory location

No matter what is it but the noise pollution doesn't have greater impact on ecosystem but it is harmful for humans because humans have limit of hearing 20KHz beyond it harms.
So what is the sound frequency in your near by......... Do you know what to do to prevent yourself from this situation. ... ..................! !!

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