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Continuingdeclinesinairpollutionarelinkedtoincreasinglifeexpectancy,anationalstudyhasfound.
美国一项全国性的研究发现,人均预期寿命的延长,跟空气污染持续减少有关。
Fromto,airpollution,asmeasuredinconcentrationsofparticulatematterlessthan2.5micrometersindiameter,hascontinuedtodecrease,althoughnotasrapidlyasinthesand90s.Buteventheslowerrateofdecreaseisapparentlylengtheninglifeexpectancy.
从年到年,用直径小于2.5微米的颗粒物密度(PM2.5)来测量的空气污染程度持续降低,尽管降低的速度没有20世纪八九十年代那样快。但是,即使空气污染程度降低的速度变慢,也显然延长了人均预期寿命。
Thestudy,publishedonlinelastweekinthejournalEpidemiology,useddatafromcountiesnationwide,bothmetropolitanandrural,andfoundanaveragedecreaseof1.56microgramspercubicmeterinparticulatepollutionovertheeightyears.Atthesametime,lifeexpectancyincreasedanaverageof0.84years.
这项研究于上周发表在《流行病学杂志》(Epidemiology)的网站上。根据来自全美个县的都市及乡村的数据,在过去的八年里,每立方米内的颗粒污染物平均减少了1.56微克。同时,预期寿命平均增加了0.84年。
Ofcourse,manyotherfactorscontributetoincreasedlifespanbesidescleanerair.Theresearcherscontrolledforsmokingprevalence,in