How to stop noise in my ears,jewellery making videos in tamil movies,hearing loss clinic in calgary ne - Step 3

Author: admin, 17.04.2016
Other forms of pollution can be measured, and scientists can estimate how much material can be introduced into the environment before harm is done. Broadly speaking, any form of unwelcome sound is noise pollution, whether it is the roar of a jet plane overhead or the sound of a barking dog a block away. The decibel (dB) is a measure of sound intensity; that is, the magnitude of the fluctuations in air pressure caused by sound waves. A sound pressure level of 0 dB represents the threshold of hearing in the most sensitive frequency range of a young, healthy ear, while the thresholds of tickling or painful sensations in the ear occur at about 120 to 130 dB. The perception of loudness by the human ear is not directly proportional to the decibel level. Because permanent hearing loss is usually a long-term process, it is impossible to know at exactly what point noise becomes loud enough to cause damage to the ears. In Canada and the United States there are no national, provincial, or state laws that give blanket protection against noise, though there are some specific regulations governing manufacturing standards, air traffic, vehicle mufflers, and so on. Governments have traditionally viewed noise as a "nuisance" rather than an environmental problem. Noise bylaws and ordinances vary widely from one municipality to another and indeed do not even exist in some towns and cities. For persistent nuisances, the individual may have to seek damages through the civil courts. Part of the difficulty lies in the fact that in some ways it is different from other forms of pollution. This is not the case for chemicals, sewage, and other pollutants introduced into the air, soil, or water.


Though we can measure individual sounds that may actually damage human hearing, it is difficult to monitor cumulative exposure to noise or to determine just how much is too much.
To some people the roar of an engine is satisfying or thrilling; to others it is an annoyance. Other factors that have to be considered are the time and place, the duration, the source of the sound, and whether the listener has any control over it.
For example, a sound 10 dB greater than another is not perceived as being ten times as loud but only about three times as loud. Outdoors, and in absence of any close reflecting surface, the effective decibel level diminishes at a rate of 6 dB for each factor of two increase in distance.
Environmental Protection Agency has established 70 dBA as a safe average for a 24-hour day. In most jurisdictions, workers are permitted to be exposed to up to 85 or even 90 dBA for eight hours.
Where they exist, they may contain a general prohibition against making noise that is a nuisance to other people, or they may set out specific guidelines for the level of noise allowable at certain times of the day and for certain activities.
Therefore any form of noise can be considered pollution if it causes annoyance, sleeplessness, fright, or any other stress reaction. This means that a doubling of sound intensity is not represented as a doubling of the decibel level. The "C" filter (dBC) puts more weight on low-frequency sounds such as the bass in amplified music.
Using the higher of these figures, the sound level in a typical nightclub, 110 dBA, could pose a risk of permanent hearing damage after as little as four minutes of exposure.


Exceptions are generally made for activities considered legitimate or necessary, such as lawn-mowing or garbage collection. Even where a municipality has an enforcement office, it may be unwilling to do more than issue warnings, since taking offenders to court is expensive. In fact, an increase of just 3 dB means twice as much sound, and an increase of 10 dB means ten times as much sound. Thus a worker should wear ear protection if exposed to a steady 75 dBA for eight hours, 78 dBA for four hours, and so on. This book presents a critical and comprehensive review of available world literature on the effects of noise on all of the body's systems. The police may also act on certain kinds of noise complaints, but generally do not assign them a high priority. Brief exposure to noises of up to 100 dBA is not considered risky provided the average remains within the prescribed levels. It defines noise and its sources, documents the specific health hazards of noise on the body and indicates needs for further research.




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