A study of 14 years of patient data from the Intermountain Medical Center Heart Institute in Utah, US, found that the risk of a heart attack or chest pain doubled for people of type A, B, or AB blood when pollution hits high levels.

美国犹他州山间医疗中心心脏科做了项实验，14年中通过收集病患数据，发现当污染严重时，A型血、B型血和AB型血的人患心脏病和胸痛的几率会翻倍。

In contrast the risk rose only rose by 40 per cent for those with type O.

然而，O型血的人患病几率只增加了40%。

"The association between heart attacks and pollution in patients with non-O blood isn't something to panic over, but it is something to be aware of,” said Dr Benjamin Horne, a clinical epidemiologist and lead investigator of the study from the Intermountain Medical Center Heart Institute in Salt Lake City.

盐湖城山间医疗中心心脏科流行病临床学博士、实验首席调查员本杰明·霍因说：“非O型血病人污染严重时易患心脏病的情况并不值得恐慌，但是需要注意。”

“In the information we provide to our patients about pollution, we try to stress that they can do something about it to reduce their risks: Stay indoors out of pollution. Exercise indoors.”

“我们跟病人说明污染情况和心脏病的联系时，都会强调他们可以通过待在室内、在室内锻炼来降低风险。”

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