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.
下面是在世界上一些大的城市的天气报告。
早上好！这是世界上部分大城市的天气报道。
Good morning! Here's the weather report for some big cities in the world.
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