Introduction:World Health Organization reported that 16% of the disabling hearing loss in adults isattributable to occupational noise exposure [1]. The association between noise and noise-inducedhearing loss (NIHL) has been known since the 18th century. NIHL remains among the 10 leadingoccupational diseases [2]. Noise-induced hearing loss usually progresses unnoticed until it beginsto interfere with communication, posing a serious safety hazard and a decrease in the quality oflife [3].The following categories are widely applied because they correspond to regulatory limits indeveloped (usually 85 dB (A)) and many developing (usually 90 dB (A)) countries for 8-hour day:Minimum noise exposure: <85 dB (A), Moderately high noise exposure: 85−90 dB (A) , High noiseexposure: > 90 dB (A). [4]. Noise induced hearing loss is an irreversible and incurabledisease [5]. Noise exposure can create permanent threshold shifts (PTS); temporary thresholdshifts (TTS), permanent or temporary tinnitus and other physical side effects such as high bloodpressure. These types of hearing damage are often referred to as noise induced hearing loss(NIHL) [6]. Noise induced hearing loss ranging from an average hearing threshold across 500,1000, and 2000Hz of 25 dB or for OSHA [7].The higher frequencies are more commonly the firstto be damaged by the hazardous noise. Hazardous noise is generally any noise that is above 85dBA [6]
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