China's National Meteorological Center (NMC)extended its fog alert Monday afternoon, warning that heavy fog would settle for a period of time in some east and central China regions.

From Monday night to Tuesday morning, fog and haze were expected to cover central and western regions of Liaoning Province, the central and southern regions of Shaanxi Province, most of the areas of North China, and regions along the Yellow and Huaihe rivers, said the NMC in an online warning statement posted at 6:00 p.m.

Some areas between the Yangtze and Huaihe rivers, and the eastern parts of the South China regions would also be shrouded in fog, the NMC said.

Visibility would diminish to 1,000 meters in some parts in south Liaoning and Hebei provinces, the east regions of Shandong, Jiangsu, and Fujian provinces, with visibility in some areas less than 500 meters, according to the NMC.

The NMC warned that drivers should decrease their speeds, and urged related departments of the nation's airports, highways, and ports to take actions to ensure traffic safety.

The NMC issued an alert at 6:00 a.m. Sunday, warning that foggy weather would affect most parts of the nation's north and central regions on Sunday.