What damages our hearing is the intensity and duration of the sound. Sound is measured in decibels (dB), where 0 is the faintest sound the human ear can detect and 180 would be the noise a rocket would make as it launches into space. In our daily lives, normal conversation would be at the 60 dB level, a lawn mower would be at 90 dB, a chain saw at 100 dB, a loud rock concert would be at 115 dB and a jet engine would be at 140 dB. Many experts believe that continued exposure to more than 85 decibels is asking for trouble. The longer you are exposed to a loud noise and the closer you are to it, the higher the risk is of damage.