時差N小時:空氣污染對心臟的影響更大

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.

一項研究發(fā)現(xiàn)，空氣污染對心臟的危害比對肺部的危害更嚴重。美國心臟協(xié)會在其主辦的雜志《循環(huán)》上刊登了這項發(fā)現(xiàn)。研究人員采用了50多萬人的信息，這些信息來自于美國癌癥協(xié)會對預(yù)防癌癥的持續(xù)研究。這個研究調(diào)查了三十歲以上的人群，他們所在的城市有關(guān)于空氣污染的官方記錄。

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.

在長達16年的研究期間，有五分之一的人死亡。研究人員發(fā)現(xiàn)其中45%的人死于心臟病。只有8%的人死于呼吸系統(tǒng)引發(fā)的疾病。研究人員還對比了150個城市的空氣污染記錄?？茖W(xué)家們排除了增加心臟病發(fā)病幾率的其它控制因素，例如吸煙和體重超標。盡管如此，他們還是發(fā)現(xiàn)空氣污染對心臟病的影響要比呼吸道疾病更大。