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研究表明，声音超过60分贝，就会对人的听力造成损害，而地铁在运行过程中，本身的噪音通常在70-80分贝左右。
不过地铁噪音，不光是指地铁行进过程中发出的“咔擦咔擦”的声音，还包括你听到的报站，提示等声音。这些声音可以很清楚的告诉我们到站，开关门，不要依靠车门等信息。但是对你的耳朵来说这是很危险的噪音。
Stand clear of the closing doors please." Definitely keep your arms and legs away from the closing doors on the subway. But there"s a potentially more insidious danger to your health: the noise.
Mass transit is generally a safe ways to travel, one reason why 33 million Americans use it every weekday. But a study that compared the various modes of mass transit in New York City found that the subways topped all other transit types for average noise, at a grinding 80 decibels. The din was sometimes worse on the platforms, topping out at 102 decibels. Commuter trains were much quieter, at about 75 decibels. Remember, that"s on a log scale, so, for example 80 is actually 10 times noisier than 70-and about three times louder than 75. Normal conversation is between 60 and 70 decibels. The study is in the American Journal of Public Health.
The EPA and the World Health Organization recommend daily averages of no more than 70 decibels to protect your hearing. So earplugs may be in order if your particular commute is literally deafening.
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