Noise Noise pollution in Hong Kong road drilling busy street traffic

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What is noise pollution? Any unwanted sound that penetrates the environment is noise pollution. In general noise pollution refers to any noise irritating.

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Presentation transcript:

Noise Noise pollution in Hong Kong road drilling busy street traffic jet plane taking off

Sound intensity level (or sound level) is measured in decibels (dB). A sound wave of higher sound intensity level generally sounds louder. threshold of hearing = lowest sound intensity level that we can hear = 0 dB 10 dB increase in sound intensity level intensity of sound is 10 times stronger

Sound intensity level / dB Sound intensity levels of some sounds: Sound Sound intensity level / dB Effects Threshold of hearing Barely audible Whisper 20 - Classroom - 35 Quiet home 50 - Conversation at 0.5 m 65 - Busy street traffic 85 -

Sound intensity level / dB Effects Hearing damage after long exposure Loud music 80 – 100 Rock concert 115 – 120 Painful to ears, permanent hearing damage Road drilling 120 Jet plane at 30 m 140 Immediate permanent hearing damage Space shuttle engine 200

Controlling noise pollution Measures taken by the Environmental Protection Department (EPD) The noise control ordinance control noise produced at construction sites. Barrier are built to block traffic noise.

Buffer area separates the residential area from busy roads Pedestrian schemes reduce traffic noise to nearby residents at night.

Things we can do We should wear ear protectors in noisy environments. Avoid exposure to loud music for a long time.

It is an offence to generate excessive noise between 11 p. m. and 7 a It is an offence to generate excessive noise between 11 p.m. and 7 a.m. or on a public holiday.

That’s the end of Section 16.6 Check Point Key Ideas Previous Page Exit