Photo taken on Jan. 17, 2018 shows a citizen riding on the street shrouded in fog in Lianyungang, east China's Jiangsu Province. China's national observatory on Wednesday continued a yellow alert for heavy fog in some northern and eastern regions. Thick fog will sweep parts of Shandong, Henan, Anhui, Jiangsu, Hubei and Hunan provinces from Wednesday morning, according to the National Meteorological Center (NMC). (Xinhua/Geng Yuhe)