世界上最脏的城市

互联热闻事 2020-09-17

《纽约时报》的《中国的污染已经到了极限》一文中,提到了一个衡量空气污染的指标。

One major pollutant contributing to China's bad air is particulate matter, which includes concentrations of fine dust, soot and aerosol particles less than 10 microns in diameter (known as PM 10).

中国空气污染的一个主要问题是微粒,包括灰尘、烟灰和其他直径小于10微米的颗粒(用PM 10表示)。

The level of such particulates is measured in micrograms per cubic meter of air.

微粒的测量方法,是计算1立方米空气里有多少毫克。

The European Union stipulates that any reading above 40 micrograms is unsafe.

按照欧盟的标准,微粒含量在40毫克以上的空气都是不安全的。

The United States allows 50.

美国的标准是50。

In 2006, Beijing's average PM 10 level was 141, according to the Chinese National Bureau of Statistics.

按照中国国家统计局公布的数字,2006年北京空气的微粒含量是141。

Only Cairo, among world capitals, had worse air quality as measured by particulates, according to the World Bank.

在世界上所有首都中,只有开罗的空气比北京更糟糕。

世界上最脏的城市