This aerial photo taken on Jan. 14, 2023 shows tourists enjoying a sight of advection fog on the Guling Hill in Jin'an District of Fuzhou, southeast China's Fujian Province. (Xinhua/Jiang Kehong)

This aerial photo taken on Jan. 14, 2023 shows advection fog which occurs around the Guling Hill in Jin'an District of Fuzhou, southeast China's Fujian Province. (Xinhua/Wei Peiquan)

This aerial photo taken on Jan. 14, 2023 shows advection fog which occurs around the Guling Hill in Jin'an District of Fuzhou, southeast China's Fujian Province. (Xinhua/Wei Peiquan)

This aerial photo taken on Jan. 14, 2023 shows tourists enjoying a sight of advection fog on the Guling Hill in Jin'an District of Fuzhou, southeast China's Fujian Province. (Xinhua/Wei Peiquan)

This aerial photo taken on Jan. 14, 2023 shows advection fog which occurs in downtown Fuzhou, southeast China's Fujian Province. (Xinhua/Jiang Kehong)

This aerial photo taken on Jan. 14, 2023 shows advection fog which occurs in downtown Fuzhou, southeast China's Fujian Province. (Xinhua/Jiang Kehong)

This aerial photo taken on Jan. 14, 2023 shows advection fog which occurs in downtown Fuzhou, southeast China's Fujian Province. (Xinhua/Jiang Kehong)

This aerial photo taken on Jan. 14, 2023 shows advection fog which occurs around the Guling Hill in Jin'an District of Fuzhou, southeast China's Fujian Province. (Xinhua/Wei Peiquan)