Problems with noise levels also are experienced by those living in close proximity to railway stations, airports, busy streets, hospitals and fire and police stations.
Even though these sounds are fleeting, their levels are extremely high for unprotected human ears and must be measured by a sound level meter to assess risk and prevent damaging exposure. Any equipment used outside ( vehicles, devices, machinery) should meet the requirements of the directives concerning noise and outdoor equipment.Įspecially in residential neighborhoods, there are particular time periods when work by means of drills and other noisy equipment can be carried out. That is why permissible levels of sound emissions are under permanent control by various regulatory agencies.
And yet noise pollution is proven to be detrimental to human health and safety. There is simply too much traffic, too many people, factories, plants, railway stations, airports and so on. Today it is nearly impossible to find a place in a town or city where there is absolute and total silence. The human ear is sensitive enough to detect changes of as little as 1/10 of a bel, and so sound intensity levels are described in decibels. The unit used to describe sound wave intensity is the bel, named after the inventor Alexander Graham Bell. Sound is a variation in pressure detectable by the ear, whereas noise is undesired sound, or any sound which causes disturbance or annoyance to the recipient.
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