南亚城市空气质量全球最差
文章来源:未知 文章作者:enread 发布时间:2011-09-30 07:35 字体: [ ]  进入论坛
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Cities in Iran, India, Pakistan and the capital of Mongolia rank among the worst on the planet for air pollution, while those in the US and Canada are among the best, according to the first global survey, released Monday by the World Health Organization.

世界卫生组织周一发布的首次全球调查显示,伊朗、印度、巴基斯坦的城市和蒙古首都是全球空气污染最严重的,而美国和加拿大城市的空气质量是最好的。

The southwest Iranian city of Ahvaz walked away with the unfortunate distinction of having the highest measured level of airborne(风媒的) particles smaller than 10 micrometers.

WHO released the list to highlight the need to reduce outdoor air pollution, which is estimated to cause 1.34 million premature1 deaths each year. The global body said investments to lower pollution levels quickly pay off due to lower disease rates and, therefore, lower healthcare costs.

The list, which relies on country-reported data over the past several years, measures the levels of airborne particles smaller than 10 micrometers — so-called PM10s — for almost 1,100 cities.

WHO recommends an upper limit of 20 micrograms for PM10s, which can cause serious respiratory(呼吸的) problems in humans. They are mostly sulfur2 dioxide and nitrogen dioxide from power plants, auto3 exhausts and industry.

Ahvaz's annual average of PM10s was 372 micrograms per cubic meter.

The study found that the Mongolian capital Ulan Bator had an annual average PM10s density4 of 279 micrograms per cubic meter, followed by another west Iranian city, Sanandaj, with 254 micrograms.

Cities in Pakistan and India, such as Quetta and Kanpur, as well as Botswana's capital Gaborone, also ranked high on the pollution scale.

WHO said the reasons for the high pollution levels varied5, but that often rapid industrialization and the use of poor quality fuels for transportation and electricity generation are to blame.

At the other end of the list are cities in Canada and the United States, which benefit from lower population density, favorable climates and stricter air pollution regulation.

Yukon territory's capital Whitehorse had a yearly average of just 3 micrograms of PM10s per cubic meter, while Santa Fe, New Mexico, measured 6 micrograms.

Washington, D.C., had a level of 18 micrograms, Tokyo measured 23 micrograms, and Paris had 38 micrograms of PM10s per cubic meter.



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1 premature FPfxV     
adj.比预期时间早的;不成熟的,仓促的
参考例句:
  • It is yet premature to predict the possible outcome of the dialogue.预言这次对话可能有什么结果为时尚早。
  • The premature baby is doing well.那个早产的婴儿很健康。
2 sulfur 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。
3 auto ZOnyW     
n.(=automobile)(口语)汽车
参考例句:
  • Don't park your auto here.别把你的汽车停在这儿。
  • The auto industry has brought many people to Detroit.汽车工业把许多人吸引到了底特律。
4 density 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。
5 varied giIw9     
adj.多样的,多变化的
参考例句:
  • The forms of art are many and varied.艺术的形式是多种多样的。
  • The hotel has a varied programme of nightly entertainment.宾馆有各种晚间娱乐活动。
TAG标签: global air pollution
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