A study finds that air pollution is worse for theheart than the lungs. The American HeartAssociation published the findings in its magazine,Circulation. Researchers used information given bymore than half-a-million adults. The information isfrom a continuing study by the American CancerSociety on cancer prevention. The study includedpeople thirty and older living in cities where officialskept records on air pollution.

一项研究发现，空气污染对心脏的危害比对肺部的危害更严重。美国心脏协会在其主办的杂志《循环》上刊登了这项发现。研究人员采用了50多万人的信息，这些信息来自于美国癌症协会对预防癌症的持续研究。这个研究调查了三十岁以上的人群，他们所在的城市有关于空气污染的官方记录。

During the sixteen-year period, one in five of the people in the study died. The scientists foundthat heart disease caused about forty-five percent of the deaths. Only eight percent of thepeople died from diseases of the breathing system. The researchers compared the informationwith air pollution records from more than one-hundred-fifty cities. The scientists controlledfor things that increase the risk of heart disease, like smoking and being overweight. Still, theyfound a stronger link between air pollution and heart disease than respiratory disease.

在长达16年的研究期间，有五分之一的人死亡。研究人员发现其中45%的人死于心脏病。只有8%的人死于呼吸系统引发的疾病。研究人员还对比了150个城市的空气污染记录。科学家们排除了增加心脏病发病几率的其它控制因素，例如吸烟和体重超标。尽管如此，他们还是发现空气污染对心脏病的影响要比呼吸道疾病更大。