Here are the average decibel rating

Here are the average decibel ratings of some familiar
sounds:
} The humming of a refrigerator 45 decibels
} Normal conversation 60 decibels
} Noise from heavy city traffic 85 decibels
} Motorcyles 95 decibels
} An MP3 player at maximum volume 105 decibels
} Siren 120 decibels
} Firecrackers and guns 150 decibels