Millions of commuters risk hearing damage because they have set the volume level too high on their MP3 players.
In the past, loud workplaces were blamed for causing the majority of harmful noise. However, researchers at Michigan University in the US found that noise from MP3 players has overtaken as the biggest danger to hearing.
Occupational health experts found nine out of 10 people using public transport were exposed to excessive noise through listening to loud music through their headphones, rather than from the environment.
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