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Over 50% of the world’s population now live in cities where they face daily issues with air quality.
目前,世界上大约一半的人口居住在城市,但他们每天却不得不面对空气质量的问题。
Air pollution is now one of the greatest external threats to health for urban dwellers.
空气污染是目前城市居民所要面对的最严重的健康威胁。
Worldwide, it is estimated that three million people more than half of them in developing countries die every year from air pollution.
据预估,每年世界上有三百万人死于空气污染相关的原因,而他们中超过一半的人生活在发展中国家。
In some cities, it is more dangerous to breath than smoke cigarettes.
在一些城市,呼吸甚至成了比抽烟更危险的事情。
One of the most dangerous pollutants is nitrogen dioxide which comes from car fumes.
二氧化氮是最危险的污染物之一,其来源为汽车尾气。
Inhaling high levels of nitrogen dioxide can reduce lung capacity, stunt lung growth and reduce life expectancy by up to six months.
吸入高浓度的二氧化氮气体可损害肺部功能,阻挠肺部发育,甚至可导致最高为6个月的减寿。
London has the highest levels of nitrogen dioxide in Europe and is ahead of Hong Kong and New York.
伦敦是欧洲二氧化氮浓度最高的国家,香港和纽约紧随其后。
Oxford Street is the most polluted street in Europe.
牛津街是欧洲污染最严重的街道。
And the worst time to be outside breathing in nitrogen dioxide in London?
伦敦市内什么时候二氧化氮浓度最高呢?
10 am
上午10点。

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Question:
When is the worst time to be outside in London
A  10:00 AM
B  12:00 AM
C  10:00 PM
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