在克拉科夫，女人们所处的环境多环芳烃含量比纽约的高8倍。
In Krakow, the women on average were exposed to eight times higher concentrations of PAHs than the women in New York City.
在克拉科夫，每平方米17.96纳克；在纽约，每平方米2.26纳克。
In Krakow, 17.96 nanograms per cubic meter; in New York City, 2.26.
在克拉科夫，很多污染物来自家庭或工厂的煤燃烧，而在纽约市，小汽车，卡车和巴士的尾气排放是主要来源。
In Krakow, most of the compounds come from coal burning for home heating and factories, while in New York City, exhaust from cars, trucks and buses is the major source.
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