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We do everything possible to keep our kids safe. But, what do you do if the very air they breathe is hurting them? Two new studies have found an association between relatively low levels of air pollution and children's risk of autism spectrum disorder (ASD). 我们竭尽所能护孩子周全。但如果人们赖以呼吸的空气伤害了他们，你又会怎么做呢？两项新研究发现：相对较低的空气污染与儿童患自闭症谱系障碍的风险之间存在关联。 One study, published in JAMA Pediatrics, studied 132,000 births in Vancouver, Canada, from 2004 to 2009. Researchers concluded there was a link between exposure to nitric oxide from car exhaust during pregnancy and greater incidence of childhood ASD. 其中一项研究发表在《美国医学会小儿科》期刊上，研究了从2004年至2009年出生在加拿大温哥华的13.2万名新生儿。研究员得出结论：孕期暴露于汽车尾气排放一氧化氮的环境与儿童患自闭症谱系障碍风险增加有关。 | 
