Aerial photo taken on Dec. 21, 2018 shows buildings shrouded in fog in Yangzhou, east China's Jiangsu Province. (Xinhua/Meng Delong)
Aerial photo taken on Dec. 21, 2018 shows buildings shrouded in fog in Yangzhou, east China's Jiangsu Province. (Xinhua/Meng Delong)
Aerial photo taken on Dec. 21, 2018 shows buildings shrouded in fog in Yangzhou, east China's Jiangsu Province. (Xinhua/Meng Delong)
Aerial photo taken on Dec. 21, 2018 shows buildings shrouded in fog in Yangzhou, east China's Jiangsu Province. (Xinhua/Meng Delong)
Aerial photo taken on Dec. 21, 2018 shows buildings shrouded in fog in Yangzhou, east China's Jiangsu Province. (Xinhua/Meng Delong)