BEIJING — China’s meteorological authority renewed a yellow alert on Jan 11 for a cold front in central and eastern regions.

Alerts for a cold wave have lasted five consecutive days, according to the National Meteorological Center (NMC).

From Jan 11 to 12, the temperature is expected to drop moderately in regions along and south of the Yellow and Huaihe rivers, the NMC said.

Meanwhile, low temperatures in parts of Shandong, Henan and Anhui will reach minus 10 to minus 12 degrees Celsius on the morning of Jan 12.

Temperatures will begin to climb gradually from Jan 12 to 13 in most of the country and reach normal levels on Jan 14.

On Jan 11, the Ministry of Environmental Protection predicted more days of air pollution in North China during the first two months of 2018.

China has a four-tier color-coded warning system for severe weather, with red representing the most severe, followed by orange, yellow and blue.