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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%。 | 
