Noise is not only just a nuisance. If it exceeds certain duration and levels of exposure, noise can cause damage your eardrum and also the inner ear cells and lead to temporary and may be permanent loss of hearing which does not happen usually below 80 D B A. This refers to an eight hour limit of exposure considered safe. People getting exposed to levels above 105 D B A risk permanent loss of hearing. Besides it can cause anxiety, irritability, fatigue, loss of sleep, and high blood pressure. Therefore, control of noise pollution is of paramount importance not only in the work area but in the community as well. Laws and ordinances on levels of noise control enacted by the respective administrating department aim at mitigating the health hazards of noise pollution.
The standards of noise for indoors are the noise criteria (NC) and preferred noise criteria (PNC) which are indicated by the curves that show the limits of level of noise in the environment. Introduced in 1957, the NC curves indicate the maximum permissible noise level in octave bands in the full audio spectrum. The PNC curves came into existence in 1971. It additionally it put limits on rumble of low-frequency and hiss of high-frequency and therefore are favored over the NC. Based on these curves, you can set design objectives on noise levels for different applications. If the level of sound goes beyond PNC limits, Acoustical materials for sound absorption are introduced to meet the requirements.
Noise of lower intensity can be controlled with noise absorbing material like sound-absorbent tiles and heavy curtains in closed rooms. Where necessary the intelligible low level noise that are distracting or privacy of oral communication in reception areas and adjoining offices are important, such sounds can be masked. A small size white-noise generator producing static or moving air, positioned inside the room, can mask the sounds to tackle this problem. Such devices are often found in the consulting rooms of doctors and other professionals. Another technique is using of hearing protectors. They are commercially available as earmuffs.
Limiting outdoor noise levels are equally important for our comfort. The normal house design provides some protection from outside sounds provided the house fulfills the minimum norms of construction and the external noise level is within permissible limits. One technique for controlling highway noise is putting up noise barriers by the sides of the highway, isolating it from adjoining residential areas. The Noise barriers will be effective only if they are close to either the observer or the source of the noise (better if closer to the source). Another condition for barrier of this type is that it should also restrict the quantity of sound transmitted so that considerable reduction of noise can be achieved.
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