全球空气污染最严重首府城市排名揭晓，印度德里高居榜首！

The world’s most polluted capital cities have been revealed, and Delhi has been exposed as the worst. Residents in India’s capital city were exposed to more than ten times the safe amount of air pollution on an average day, a study has shown. Dhaka, in Bangladesh, ranked second-worst with ten times the safe limit while Kabul, in Afghanistan, ranked third, with six times the same limit. New Zealand’s capital city of Wellington is the least polluted, falling well under WHO guidelines for safe amounts of air pollution. 
The report was published by IQ AirVisual and Greenpeace which calculated the average amount of PM2.5 air pollution in each city. Researchers focused on the amount of PM2.5s because they are the smallest and most harmful type of airborne particles which can lodge deep in the lungs. 
The study’s authors wrote that poor air quality “is the greatest environmental risk to health  and contributes to an estimated 7 million deaths each year.” Yeb Sano, executive director of Greenpeace Southeast Asia, said, “Air pollution steals our livelihoods and our futures, but we can change that. In addition to human lives lost, there’s an estimated global cost of $225 billion in lost labour, and trillions in medical costs.”
In total, authors found that 64 per cent of world cities exceeded WHO guidelines, with 100 per cent of measured cities in the Middle East and Africa breaking the limit. Meanwhile 99 per cent of cities in South Asia, 95 per cent of cities in Southeast Asia, and 89 per cent of cities in East Asia also exceeded this target. Gurugram, in northern India, was found to have the worst air of any city in the world, with Faisalabad in Pakistan in third.

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1.Which is the cleanest capital city?

A Delhi.

B Dhaka.

C Kabul.

D Wellington.

解析：选D。细节理解题。根据第一段最后一句New Zealand’s capital city of Wellington is the least polluted, falling well under WHO guidelines for safe amounts of air pollution. 可知惠灵顿是世界上污染最轻的首都。故选D。

2.What is the ranking of this report based on?

A The WHO guidelines.

B The IQ AirVisual.

C The Greenpeace.

D The amount of PM2.5s.

解析：选D。细节理解题。根据第二段的内容可知研究人员的报告是根据空气中的PM2.5的数量来进行排名的。故选D。

3.What does Paragraph 3 mainly talk about?

A The harm caused by air pollution.

B The health risks from air pollution.

C The massive loss of life and labour by air pollution.

D The huge medical costs due to air pollution.

解析：选A。段落大意题。通读第三段可知，此段主要介绍了空气污染带来的一系列危害，包括健康危害、生活和生命威胁、劳动力损失和庞大的医疗支出等。故选A。

4.What do the authors think of the situation of the world’s air pollution?

A It is promising.

B It is excellent.

C It is terrible.

D It is instructive.

解析：选C。推理判断题。通读最后一段可知，此段介绍了目前全球城市空气污染的现状，根据研究人员的调查结果可知一半以上的城市超过了世卫组织的标准，被调查的各亚洲和非洲城市的污染状况都不容乐观，因此可推知作者认为这一问题非常严重。故选C。