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It’s not clear why, exactly, heavy traffic could cause premature birth. Air pollution from car exhaust could have something to do with it. Some studies have found that women exposed to high levels of carbon monoxide were up to twenty-five percent more likely to have a preterm baby than women in areas with cleaner air. It’s also possible that loud noise from highways and freeways could play a role by disturbing pregnant women’s sleep. Losing sleep typically causes stress, which is linked to premature birth. Whatever the specific cause, these studies at the very least suggest that loud, heavy traffic, and pregnancy don’t mix.
目前尚不清楚，究竟為什么，交通繁忙可能導致早產(chǎn)的確切原因。從汽車尾氣造成的空氣污染可能與之有些聯(lián)系。一些研究發(fā)現(xiàn)，暴露在高濃度的一氧化碳中的婦女比在空氣清潔的地區(qū)的婦女高達早產(chǎn)的可能性高達百分之二十五。公路和高速公路的巨大噪音也有可能會干擾孕婦的睡眠。失眠通常會導致壓力，而壓力與早產(chǎn)有關。無論具體原因是什么，至少在這些研究表明，發(fā)出巨大噪音的繁忙交通應當與孕婦分離。
