In Hong Kong, noise from motor vehicles including motorcycles is under control and should meet internationally recognized noise emission standards for first registration in Hong Kong (For details, please click here). Whenever possible, quieter working methods or technologies should be used. It is often a primary consideration to reduce noise at its source. To reduce environmental noise, one can consider the following methods: The severity of the problem depends on the strength of the noise source (such as heavy or light traffic) or the length of the path, that is, how large is the separation between the noise source and the receiver. ![]() The noise will be perceived as a problem when the noise is so high as to be a nuisance to the receiver. ![]() The noise is transmitted through a path and then arrives at the receiver. The following diagram shows a common noise situation in many populated cities:Ī noise problem starts with a noise source such as a stream of traffic on a highway. ![]() What are the principles of controlling noise?
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