An unwanted or unpleasant sound is known as noise. We can
sense sound with the help of ears. Sound can be described in terms of its
loudness and its pitch (or frequency).Loudness is measured in decibels (dB) and
itch is measured in cycles (waves per second). Cycles per second is known as
Hertz (Hz). The range of frequency to which human ear is sensitive is
20-20,000Hz.
Today, noise pollution has become one of the major and
difficult problems to be handled. Noise pollution is caused by many different pollutants.
But these pollutants can be grouped into four categories:
1. Transportation
2. Industry
3. Household
4. Military
Noise pollution is increasing in cities day by day. The main
disadvantage of industrialisation is that it has increased pollution to a vast
degree. In terms of daily noise, we can give the credit to vehicles on road.
They produce so much noise that people get irritated. Home appliances also add
to noise pollution. Although most of the appliances are becoming noise free
with advanced technology but still they have a considerable amount of
contribution.
Noise pollution can increase the sufferings of heart
patients, high blood pressure patients and people suffering from insomnia etc.
Sudden noises can cause the heart beat increase considerably. Noise interferes
with sleep very much. It disturbs very much while concentrating on something.
It induces irritability id it is caused during the time of relaxation and
leisure.
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