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NOISE AND HEALTH
INTRODUCTION
•Noise – wrong sound in the wrong place in the wrong time
•Daily exposure up to 85 dB is tolerable level
•Worldwide, noise-induced hearing impairment is the most prevalent irreversible occupational hazard
Acceptable noise levels(dB)
•Education : class – 30-40 library – 35-40
•Hospitals : wards – 20-35
•Residential : bed room – 25 living room – 40
•Commercial : office – 35-45 restaurant – 40-60
• Industry : workshop – 40-60 lab – 40-50
EFFECTS OF NOISE Auditory effects
•Auditory fatigue – 90 dB, 4000Hz
•Deafness - temporary - permanent - occupational HL Permanent deafness – repeated exposure to
noise of 100dB / sudden exposure to 160dB or more
Non auditory effects• Interference with speech - 300 - 500hz Speech sound level should exceed SIL by
12dB
•Annoyance
•Efficiency
•Physiological changes
•Economic losses
CONTROL OF NOISE
•Careful planning of cities
•Control of vehicles
•Industries and railways
•Acoustic insulation of buildings •Protection of exposed persons
•Legislation - The Noise Pollution (Regulation and Control) Rules, 2000
•Education
Ear plugs
Ear muff
Thank
you
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