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This is Scientific American’s 60-Second Science, I’m Steve Mirsky. Got a minute?
“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 insidious1 danger to your health - the noise.
Mass transit2 is generally a safe way 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 decibels4. The din3 was sometimes worse on the platforms, topping out at 102 decibels. Commuter6 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 commute5 is literally7 deafening8.
1 insidious | |
adj.阴险的,隐匿的,暗中为害的,(疾病)不知不觉之间加剧 | |
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2 transit | |
n.经过,运输;vt.穿越,旋转;vi.越过 | |
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3 din | |
n.喧闹声,嘈杂声 | |
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4 decibels | |
n.分贝( decibel的名词复数 ) | |
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5 commute | |
vi.乘车上下班;vt.减(刑);折合;n.上下班交通 | |
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6 commuter | |
n.(尤指市郊之间)乘公交车辆上下班者 | |
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7 literally | |
adv.照字面意义,逐字地;确实 | |
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8 deafening | |
adj. 振耳欲聋的, 极喧闹的 动词deafen的现在分词形式 | |
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