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Noise Levels in the surroundings Bird Chirp - 10-15 dB The humming of a refrigerator - 40-45 decibels Normal conversation 50- 60 decibels Noise from heavy city traffic - 80-85 decibels Motorcycles - 95 decibels An MP3 player at maximum volume - 105 decibels Sirens - 120 decibels Firecrackers and firearms - 150 decibels As defined by NOHSC: 2009(2004), occupational noise-induced hearing loss (NIHL) means hearing impairment arising from exposure to excessive noise at work. Occupational noise-induced hearing loss is also commonly known as industrial deafness.
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