I wanted to post this article titled Working or Playing Indoors, New Yorkers Face an Unabated Roar from the New York Times. I believe that it is the first article in a series that will explore the changing, and sometimes deafening, soundscape in New York City.
In many restaurants and gyms, the noise can average over 96 decibels, which if sustained for a long period of time can cause hearing loss. I did a quick check in Pierce's book The Science of Musical Sound to locate his chart on Sound Intensities Expressed in Decibels.
Level (dB) 0 = the threshold of hearing. Level (dB) 120= the threshold of feeling.
This is an interactive Sound Tour of New York City