树木能拯救生命并减少呼吸道疾病-凯发k8官网

树木能拯救生命并减少呼吸道疾病
文章来源:未知 文章作者:enread 发布时间:2014-07-29 06:26 字体: [ ] 
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in the first broad-scale estimate of air pollution removal by trees nationwide, u.s. forest service scientists and collaborators calculated that trees are saving more than 850 human lives a year and preventing 670,000 incidents of acute respiratory symptoms. while trees' pollution removal 1 to an average air quality improvement of less than 1 percent, the impacts of that improvement are substantial. researchers valued the human health effects of the reduced air pollution at nearly $7 billion every year in a study published recently in the journal environmental pollution.
 
the study by dave nowak and eric greenfield of the u.s. forest service's northern research station and satoshi hirabayashi and allison bodine of the davey institute is unique in that it directly links the removal of air pollution with improved human health effects and associated health values. the scientists found that pollution removal is substantially higher in rural areas than urban areas, however the effects on human health are substantially greater in urban areas than rural areas.
 
"with more than 80 percent of americans living in urban area, this research underscores how truly essential urban forests are to people across the nation," said michael t. rains, director of the forest service's northern research station and the forest products laboratory. "information and tools developed by forest service research are contributing to communities valuing and managing the 138 million acres of trees and forests that grace(使优美) the nation's cities, towns and communities."
 
the study considered four 2 for which the u.s. epa has established air quality standards: nitrogen dioxide, 3, 4 dioxide, and 5 matter less than 2.5 microns (pm2.5) in aerodynamic(空气动力学的) diameter. health effects related to air pollution include impacts on pulmonary(肺的), cardiac, 6, and neurological systems. in the united states, approximately 130,000 pm2.5-related deaths and 4,700 ozone-related deaths in 2005 were attributed to air pollution.
 
trees' benefits vary with tree cover across the nation. tree cover in the united states is estimated at 34.2 percent but varies from 2.6 percent in north dakota to 88.9 percent in new hampshire.
 
"in terms of impacts on human health, trees in urban areas are substantially more important than rural trees due to their 7(接近,临近) to people," nowak said. "we found that in general, the greater the tree cover, the greater the pollution removal, and the greater the removal and population 8, the greater the value of human health benefits."


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1 4e5ed63ebe0d19855344c43d4526ea4f     
adj.换算的v.认为某事物(与另一事物)相等或相仿( equate的过去式和过去分词 );相当于;等于;把(一事物) 和(另一事物)等同看待
参考例句:
  • production costs for the movie equated to around 30% of income. 这部电影的制作成本相当于收益的30%。
  • politics cannot be equated with art. 政治不能同艺术等同起来。
2 694861490fe64672170a0da250a277c7     
污染物质(尤指工业废物)( pollutant的名词复数 )
参考例句:
  • pollutants are constantly being released into the atmosphere. 污染物质正在不断地被排放到大气中去。
  • the 1987 amendments limit 301(g) discharges to a few well-studied nonconventional pollutants. 1987年的修正案把第301条(g)的普通排放限制施加在一些认真研究过的几种非常规污染物上。 来自英汉非文学 - 环境法 - 环境法
3 omqzbe     
n.臭氧,新鲜空气
参考例句:
  • the ozone layer is a protective layer around the planet earth.臭氧层是地球的保护层。
  • the capacity of ozone can adjust according of requirement.臭氧的产量可根据需要或调节。
4 ps4wc     
n.硫,硫磺(=sulphur)
参考例句:
  • sulfur emissions from steel mills become acid rain.炼钢厂排放出的硫形成了酸雨。
  • burning may produce sulfur oxides.燃烧可能会产生硫氧化物。
5 4mmzpg     
adj.微小的;n.微粒,粒子
参考例句:
  • a special group was organized to dig up the particulate of the case.成立了一个专门小组来查明该案件的各个细节。
  • lungs retain relatively insoluble particulate material.肺脏内留有不溶解的颗粒物质。
6 cidw6     
adj.血管的,脉管的
参考例句:
  • the mechanism of this anomalous vascular response is unknown.此种不规则的血管反应的机制尚不清楚。
  • the vascular changes interfere with diffusion of nutrients from plasma into adjacent perivascular tissue and cells.这些血管变化干扰了营养物质从血浆中向血管周围邻接的组织和细胞扩散。
7 5rsxm     
n.接近,邻近
参考例句:
  • marriages in proximity of blood are forbidden by the law.法律规定禁止近亲结婚。
  • their house is in close proximity to ours.他们的房子很接近我们的。
8 rodzz     
n.密集,密度,浓度
参考例句:
  • the population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
  • the region has a very high population density.该地区的人口密度很高。
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