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Environmental Education

Environmental Education. Noise Pollution. Content . Definition of noise Characteristics of sound / noise Measurement of sound / noise Impacts of noise Noise pollution in Hong Kong Noise control in Hong Kong. Which one is noise?. Definition of Noise [1]. Do you like these sound?. A.

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Environmental Education

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  1. Environmental Education Noise Pollution

  2. Content • Definition of noise • Characteristics of sound / noise • Measurement of sound / noise • Impacts of noise • Noise pollution in Hong Kong • Noise control in Hong Kong

  3. Which one is noise? Definition of Noise [1] • Do you like these sound? A B C

  4. Definition of Noise [2] • How do you define a noise? • Any unwanted sound can be regarded as ‘noise’

  5. Characteristics of Sound [1] • Pure sound

  6. Infrasound Audible sound Ultrasound 16Hz 20,000Hz Characteristics of Sound [2] • Frequency • Hertz (Hz) • Low v.s. High • Infrasound, Audible sound and Ultrasound

  7. Characteristics of Sound [3] • Amplitude • Loudness of a sound • Amplitude  vibration in the ear mechanism  brain’s perception  Loudness • Sound Pressure Level (SPL) (dB)

  8. Characteristics of Sound [4] • Highest SPL : 194 dB • Lowest SPL : 0 dB

  9. Noise Level Examples

  10. Characteristics of Sound [5] • Temporal Variation • Sound level change at different time.

  11. Measurement of Sound • Sound Level Meter

  12. Impacts of Noise • disturb people’s thoughts and feelings • affect digesting system • bring hypertension and emotional upsets • cause allergies, enuresis, spinal meningitis

  13. Noise Pollution in Hong Kong [1] • Types of noise • Traffic – engines, exhaust pipes, horns, moving… • Aircraft – height, landing and taking-off, aircraft design …

  14. Noise Pollution in Hong Kong [2] • Types of noise • Construction – machines, building demolition … • Industrial • Domestic – alarming clock, snoring noise, doorbells, radios/TV …

  15. Noise Control in Hong Kong[1] • Statutory controls • Environmental Protection Department • Noise Control Ordinance • Labour Department • Factories and Industrial Undertakings Ordinance

  16. Noise Control in Hong Kong [2] • Abatement strategies • Protecting the recipient • Earplugs • Sound Absorption • Sound absorption materials

  17. Noise Control in Hong Kong [3] • Reducing the source of the noise • Stringent vehicle design rule • Controlling traffic volume and the traffic conditions • Paving noise absorption road surface

  18. To protect Student and Residents Noise Control in Hong Kong [4] • Changing the path of noise • Placing noise barriers along major roads

  19. To protect Residents Noise Control in Hong Kong [5] • Building noise enclosure

  20. Noise barrier from podium Noise tolerant portions Portions not affected by noise Noise Control in Hong Kong [6] • Integrating noise reduction into building design

  21. Noise Control in Hong Kong [7] • Site Planning • Maximizing setback by using recreation and garden Noise tolerant commercial centre + maximizing setback from roads

  22. Discussion • What are the typical noises in residential areas? • What do you feel when hearing noises? • Can you identify any control measures or building design that aim to reduce noise? • What action can you take to reduce noise pollution?

  23. Relevant Websites [1] • Environmental Protection Department (http://www.info.gov.hk/epd/) • Noise Management amd Policy Group (http://www.info.gov.hk/epd/noise/main.html) • Occupational Safety & Health Council (http://www.oshc.org.hk/eng/) • Noise Watch Online (Canada, a non-profit volunteer organization) (http://www3.sympatico.ca/noise/) • Noise Pollution Clearinghouse (USA, a national non-profit organization) (http://www.nonoise.org/)

  24. Relevant Websites [2] • Netherlands Noise and Traffic Site (http://www.xs4all.nl/~rigolett/ENGELS) • U.K. Noise Act (1996) (http://hmso.gov.uk/acts1996/1996037.htm) • European Commission’s Green Paper on Future Noise Policy (http://europa.eu.int/en/record/green/gp9611/noise.htm) • Environmental Protection Agency (USA) (http://www.epa.gov/docs/epacfr40/chapt-1.info/subch-G/) • House Ear Institute (LA, USA) (http://www.hei.org/welcome.htm)

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