Fog makes trouble, but clearing on way

China's top observatory on Sunday renewed a yellow alert for thick fog, which forced the temporary closure of expressways in large areas of northern, central and eastern China.

In the worst-affected areas, visibility was reduced to less than 50 meters.

On Sunday, thick fog affected Tianjin, as well as some parts of Hebei, Henan, Anhui, Hubei, Shandong and Jiangsu provinces, reducing visibility in some areas to less than 200 meters, the National Meteorological Center said on its website.