The other hitch is that many parts of Delhi – particularly its southern quarters where parliament, the presidency and the prime minister are all based – are within a strictly policed no-fly zone.
另一个障碍是,德里的很多地区——尤其是议会、总统和总理府所在的南部地区——都是监管严格的禁飞区。
想靠直升机驱霾,但直升机要等霾散了、能见度提高了才能上天,这本身就是个悖论。话说回来,德里这次“雾霾危机”是由什么原因造成的呢?
A 2017 study found that 52% of the particulate matter in the city’s air was from dust kicked up by the tens of thousands of cars on its roads. Uncovered sand and soil from construction sites also contribute to the choking atmosphere.
2017年的一项研究发现,德里市空气中52%的颗粒物来源于道路上数以万计的汽车造成的扬尘。建筑工地上没有覆盖的沙土也是引发令人窒息的大气污染的源头之一。
In the last week, massive crop burning in neighbouring states and slow winds have also been a factor in sending air pollution levels in parts of north India to more than 30 times the World Health Organisation standards for daily exposure.
上周邻近各邦大规模焚烧的秸秆和风速缓慢也是导致印度北部部分地区空气污染超过世界卫生组织空气质量标准30多倍的一个因素。
注:世界卫生组织认为,PM2.5平均浓度小于10微克/立方米是安全值。PM2.5指直径小于等于2.5微米的颗粒物。
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