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Noise Pollution


This particular pollution is ever increasing with due to the rise in the utilization of heavy duty machineries of industrial facilities and vehicles, synonymous to the increase in the standard of living in most countries. We make sounds practically every seconds of our day, but to the extend it has reached an unfavorable high intensity which had cause many disturbances and irritation to others emotionally that has adverse effects on our daily activities.

Noise levels can be measured by decibel method:

Decibel - one tenth of a bel where one bel represents a difference in level between two intensities I1, I0 where one is ten times greater than the other. Thus, the intensity level is the comparison of one intensity to another and may be expressed:

Intensity level = 10 log10 (I1/I0) (dB)

For instance, the difference between intensities of 10-8 watts/m2 and 10-4 watts/m2, an actual difference of 10,000 units, can be expressed as a difference of 4 bels or 40 decibels.

These are the few examples of threshold decibels of noises made:

Threshold of hearing

0 dB

Motorcycle (30 feet

88 dB

Rustling leaves

20 dB

Food blender (3 feet)

90 dB

Quiet whisper (3 feet)

30 dB

Subway (inside)

94 dB

Quiet home

40 dB

Diesel truck (30 feet)

100 dB

Quiet street

50 dB

Power mower (3 feet)

107 dB

Normal conversation

60 dB

Pneumatic riveter (3 feet)

115 dB

Inside car

70 dB

Chainsaw (3 feet)

117 dB

Loud singing (3 feet)

75 dB

Amplified Rock and Roll (6 feet)

120 dB

Automobile (25 feet)

80 dB

Jet plane (100 feet)

130 dB

Other noise measurement systems are:

  • community noise equivalent level

  • composite noise rating 

  • equivalent energy level

  • noise and number index

  • noise exposure forecast 

  • noise criterion

  • noise level

  • noise pollution level

  • noise rating

  • perceived noise level

  • traffic noise index

  • sound level

  • sound level meter

  • sound pressure level

  • world soundscape project

Sources and Methods

We can classify major sources that lead to noise pollution to the following categories:

  • road traffic noise

  • air traffic

  • rail traffic

  • neighborhood and domestic noise

  • incompatible land use

  • industrial noises

Source : http://library.thinkquest.org


Effecting Ears

Through Loudspeaker

Noise Pollution

.Noise Pollution

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