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1. NOISE AND HEALTH

2. 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

3. 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

4. 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

5. Non auditory effects
• Interference with speech - 300 - 500hz
Speech sound level should exceed SIL by 12dB
• Annoyance
• Efficiency
• Physiological changes
• Economic losses

6. CONTROL OF NOISE
• Careful planning of cities
• Control of vehicles
• Industries and railways

7. • Acoustic insulation of buildings
• Protection of exposed persons Ear muff
• Legislation - The Noise Pollution (Regulation and
Control) Rules, 2000
• Education
Ear plugs