Noise is unwanted sound. The results of national surveys of typical exposure to noise show that over 50 per cent of the population are exposed to daytime noise levels that exceed the World Health Organization (WHO) ratings for significant community annoyance. Other surveys report that around 50 per cent of people find their home in some way unsatisfactory because of noise intrusion. These results include people living in new homes built to modern building codes which require certain standards of noise control. A satisfactory environment of sound quality therefore needs to be a major consideration when we create our built environment. Your knowledge will be enhanced by also referring to the related chapters on Aspects of sound and on Room acoustics.
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