The source of most of the noise comes from transportation systems like motor vehicle noise, but also including aircraft noise and rail noise.Poor urban planning may give rise to noise pollution, since side-by-side industrial and residential buildings can result in noise pollution in the residential area.
A list of other noise sources:car alarms, office equipment, factory machinery, construction work, grounds keeping equipment, barking dogs, appliances, power tools, lighting hum, audio entertainment systems, loudspeakers and noisy people.
Human health efects
Noise pollution can damage health physiological and psychological, and can cause annoyance and aggression,hypertension , high stress levels, hearing loss, sleep disturbances, and other harmful effects.
Some of those can cause other consequences like stress and hypertension can lead to depression and panic attacks.
High noise levels can contribute to cardiovascular effects and exposure to moderately high levels during a single eight hour period causes a statistical rise in blood pressure.
Environmental Effects
Noise effect on animals causes stress, increasing risk of mortality by changing the balance in predator/prey detection and avoidance, and by interfering with their use of sounds in communication especially in relation to reproduction and in navigation.
This noise pollution can leade some species to extintion one example is the beached whales , brought on by the loud sound of military sonar.
Scientists and researchers have conducted experiments that show whales song length is longer when submarine-detectors are on and when one species begins speaking louder, it will disturb other species voice, causing the whole ecosystem to eventually speak louder.
Sources:
http://en.wikipedia.org/wiki/Sound_pollution
http://blogs.venturacountystar.com/greenberg/archives/qqxsgSonarWhales.jpg
http://www.telegraph.co.uk/portal/graphics/2007/04/12/ftnoise112.jpg
http://www.kf6nvr.net/blog/archives/images/computing_stress.jpg
Um comentário:
It´s true that some loud noises sometimes change animal behavior.
Some time ago i saw a programme on TV where a young bear atacked a woman just because she was playing a song with her guitar.Although she survived, the young bears almost killed her.
GoOd ToPiC =P
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