1. Noise: The Invisible Hazard

2. WHAT IS NOISE? WHAT ARE THE EFFECTS OF NOISE? WHY MORE STRESS ON NOISE?

3. Did you know......noise is the most common hazard?...hearing loss from noise is slow and painless; you can have a disability before you notice it?...hazardous noise is found off the job from things like power tools, lawn mowers and guns?power toolslawn mowers...you can protect yourself from hazardous noise?

4. Noise is often defined as undesired or unwanted sound or sound without agreeable musical quality.

5. BUT, this definition is subjective because of the fact that one man’s sound is other man’s noise, so we can define noise in a better way as :

6. Noise is “wrong sound in wrong place at wrong time.”

9. Sources of noise: They are many and varied: Automobiles Factories Industries Aircrafts Domestic like TV, coolers, mixies etc.all adding to the quantum of noise in daily life.

11. Effect of noise on ears: They are of two types:-- Non-auditory. Auditory

12. NON-AUDITORY EFFECTS: Interference with speech Communication: Annoyance: EFFICIENCY: FATIGUE: PHYSIOLOGICAL EFFECTS

13. PHYSIOLOGICAL EFFECTS Rise in B.P, Rise in intra cranial pressure, Increase in heart rate, Breathing, Sweating, General symptoms like giddiness, Nausea may also occur. Noise interferes with sleep.

14. AUDITORY EFFECTS: It appears in the 90db.region and is greatest at 4000Hz,may be associated with whistling and buzzing in the ears. The most serious pathological auditory effect is DEAFNESS or hearing loss.

15. This loss can be: Temporary Permanent Repeated or continous exposure to noise around 100 db may result in permanent hearing loss. Exposure to noise above 160db may rupture tympanic membrane that leads to permanent loss of hearing.

16. Every person responds differently to noise.

17. ROUTINE NOISE LEVELS IN DECIBLES: Whispering 20-30db. Slow and soft music 40-50db. Normal conversation 60-65db. Heavy traffic 80db. Air -plane 120db. Jet engine 140db.

18. COMMERCIAL NOISE LEVELS IN DECIBLES Type writer 80db. Lathe machine 85db. Fabrication workshop 100db. Drill machine 110db. Blasting 110db.

19. ACCEPTABLE NOISE LEVELS Residential: Bedroom 25db. Living room 40db Office 35-45db. Conferences 40-45db. Workshop 40-60db. Laboratory 40-50db. Class room 30-40db. Library 35-45db. Hospital wards 20-35db.

20. A daily exposure up to 85db is above the limit people can tolerate without substantial damage to their hearing. SAFE ZONE UP TO 85db DANGER ZONE 90-120db. DANGEROUS ZONE >120db.

21. Common sounds may be louder than you think...

22. Factors affecting injury to ear due to noise exposure: Intensity Frequency range Duration of exposure Individual susceptibility

25. NOISE CONTROL Control of noise at source Control of transmission:- this maybe achieved by: Building enclosures. Covering the room wall and floor with sound absorbing material.

26. Protection of exposed persons:- Employees must be regularly rotated from noisy areas. -Periodic audiogram checks. -Use of ear plugs /muffs are also essential

28. No noise abatement programme can succeed without people’s participation.

29. The main aim of this information is to motivate people against noise pollution in their daily living activities and lead an improved quality of life.

30. THANKS