A man takes photos of sunset at Shichahai scenic area in Beijing, capital of China, Sept. 3, 2020. (Xinhua/Li He)

A man runs near the Qianman subway station in Beijing, capital of China, Sept. 3, 2020. (Xinhua/Cai Yang)

Photo taken on Sept. 3, 2020 shows a view of the sunset glow in Xicheng District in Beijing, capital of China. (Xinhua/Chen Zhonghao)

People take photos of a rainbow at Shichahai scenic area in Beijing, capital of China, Sept. 3, 2020. (Xinhua/Li He)

A rainbow is seen in the sky above the Palace Museum in Beijing, capital of China, Sept. 3, 2020. (Xinhua/Xing Guangli)

Photo taken with a mobile phone shows a view of a turret of the Palace Museum in Beijing, capital of China, Sept. 3, 2020. (Xinhua/Jin Liangkuai)