Noise from personal music players is a routine annoyance for travelers on buses, trains and planes. But it also threatens permanent hearing loss for as many as 10 million Europeans who use them, according to a scientific study for the European Union that will be published Monday. The report said that those who listened for five hours a week at high-volume settings exposed themselves to more noise than permitted in the noisiest factory or work place. Maximum volume on some devices can generate as much noise as an airplane taking off nearby.
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