1. Noise Exposure and the OSHA Standard
Presented By: Stephen Jurss, CIH, CSP
Civil Engineering Bldg. Rm. B173
TX: ,

2. Introduction
Definition of Noise?
Unwanted sound.

3. The Physics of Sound

4. The Physics of Sound

5. The Physics of Sound

6. Anatomy of the Human Ear

7. Anatomy of the Human Ear

8. Noise Convection and Conduction

9. Physiology of the Cochlea

10. Cochlea Cilia

12. Operation of the Cochlea

13. Healthy Cochlea
The cilia ( sensory hairs) appear normal

14. Damaged Cochlea
Loss of cilia as a result of Noise

15. Sound Levels

16. OSHA Noise Standard 2 Program Strategy – TWA- Time Weighted Average
Noise Exposure Program – 90 dBA 8 hour TWA(Equivalent Exposure Concept)
Hearing Conservation Program – 85 dBA 8 hour TWA
TWA- Time Weighted Average

17. OSHA Regulation – Exposure Level vs Duration

18. Noise Measuring Equipment
Sound Level Meters (SLM)
Continuous on-mobile sources
Noise Dosimeters
Mobile/variable
noise sources

19. Noise Control Measures
Engineering Controls – Enclosure,
Sound Dampening and Absorption
Administrative Controls
Use of Hearing Protection Devices -
Noise Reduction Rating (NRR)

20. Hearing Protection Devices and Their Noise Reduction Ratings
EAR Foam Plugs (NRR = 29 dB)
EAR CARBOFLEX (NRR= 20 dB)
Moldex PURAFIT Foam Plugs
(NRR=30 dB)