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.