Auditory fatigue is seen at
Auditory fatigue occurs at 90dB, 4000Hz. 90dB for 8hour a day for 5weeks is the maximum safe limit. (Ref: Diseases of EAR, NOSE AND THROAT by PL DHINGRA - 6th Edition)
90 dB, 4000Hz
110 dB, 4000Hz
130 dB, 4000Hz
150 dB, 4000Hz
Ear