它还能使你的房子凉快下来，增加氧气含量，这是对生活在这个炎热、污染严重的城市的馈赠。
It also cools down your flat and increases oxygen content — a welcomed perk for those living in this hot, polluted city.
最严重的是在19年，因为寒冷的天气和无风的条件，污染的空气覆盖了城市，这震惊了整个世界。
The heaviest, which shocked the world, was in 19 because of cold weather and windless conditions, polluted air covered the city.
正如报纸上所报道的，北京和武汉等大城市的空气污染已经变得越来越严重。
As is reported in the newspaper, the air pollution in some big cities, such as Beijing and Wuhan, has become more and more serious.
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