Video PlayerClose

In this aerial photo taken on April 19, 2019, the Shanghai Tower, a 632-meter skyscraper, is surrounded by thick fog in east China's Shanghai. (Xinhua/Shen Chunchen)
In this aerial photo taken on April 19, 2019, the Shanghai Tower, a 632-meter skyscraper, is surrounded by thick fog in east China's Shanghai. (Xinhua/Shen Chunchen)