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Noise Pollution

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Submitted By nivragabriel
Words 2146
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CONTENTS

S.No Titles Page No Introduction
1. Classification of Noise 1 1.1 Community Noise 2 1.2 Occupational Noise 2
2 Effect of Noise on Public Health 3
3 Noise Standards in Pakistan 4 3.1 Motor Vehicle Rules, 1969 5
4

Studies and Data for Removal of Pressure Horns in
Different Cities of Pakistan
6
4.1 Environmental Protection Agency, NWFP 6 4.2 Environment Protection Department, Punjab 6
5 Major Steps Taken by Ministry of Environment 7
8 References 8

INTRODUCTION Noise is an unwanted, unpleasant and annoying sound caused by vibration of the matter. Vibrations impinge on the ear drum of a human or animal and setup a nervous disturbance, which we call sound. When the effects of sound are undesirable that it may be termed as “Noise”. Noise from industry, traffic, homes and recreation can cause annoyance, disturb sleep and affect health. Thus, sound is a potentially serious pollutant and threat to environmental health.
The response of the human ear to sound depends both on the sound frequency
(measure in Hertz, Hz) and the sound pressure, measured in decibels (dB). A normal ear in healthy young person can detect sounds with frequencies from 20Hz to 20,000 Hz. Noise measurements are expressed by the term Sound Pressure Level (SPL) which is logarithmic ratio of the sound pressure to a reference pressure and is expressed as a dimensionless unit of power, the decibel (dB). The reference level is 0.0002 microbars, the threshold of human hearing. Decibel Leq = 10 log10 L/L° Leq = Equivalent Noise level
L = Sound Intensity
L° = Reference level If a measurement of noise emission is required a sound level meter is used. A measure of the level of sound is called the decibel. The zero of the decibel scale is the hearing threshold. Sounds at 0–10 decibel are so

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