The World Health Organization recently said that over 1.1 Billion people around 18 - 25 ages are at risk of hear loss due to overuse of personal audio devices such as Headphones and Earphones. And also because of High-Volume music at Bars, Clubs, And Concerts. Hearing loss has potentially devastating results for physical and mental health, education and employment.
How to Prevent this ?
WHO recommends that the highest level of noise should be 85dB only up to 8 hours a day. People should wear ear plugs whenever they visit any concert, night club or bars or anywhere there is loud noise.
WHO also recommends teenagers to limit their listening time to less than one hour a day. You can also use smartphone applications, to monitor safe listening levels.
Some Smartphone Apps :-
For Android :- deciBel , Sound Decibel Meter
For iOS :- TooLoud Pro , dB Volume Meter
For Windows Phone :- Audio Meter , Decibel Meter
Source :- http://www.who.int/mediacentre/news/releases/2015/ear-care/en/