Zhangjiakou is drafting plans to improve air quality as it prepares to co-host the 2022 Winter Olympics with Beijing, the Zhangjiakou government said on Wednesday.
Survey reveals white-collar Beijingers lost an average of 7,972 yuan to traffic jams last year, the highest in China.
Men in Chinese mainland outnumbered women by 33.66 million in a country of more than 1.37 billion by the end of 2015.
The railway police in 2015 apprehended 40,315 criminals who were attempting to use the railway to avoid capture, an increase of 13.2 percent from the previous year, the police said Wednesday.
Government is set to introduce a real-name registration system for migrant workers to better protect their rights in cases of pay defaults.
Schools have been suspended and emergency workers are on standby as provinces brace for a week-long cold wave.
Three people were confirmed dead and another one remains missing after blasts swept a fireworks plant in east China's Jiangxi Province early on Wednesday, according to local authorities.
China's weather observatory announced a blue alert Wednesday morning for snow storms that will sweep south China in the coming days.
10 winter swimming enthusiasts laugh and smile during a cold tolerance challenge at a ski resort in Changsha, central China's Hunan province, Jan 19, 2016
The permanent population of China's capital of Beijing was 21.7 million by the end of 2015, close to the whole of Australia, despite it being the slowest growth in years, according to official data.
Defined as people between 16 to 60, the working-age population fell by a record 4.87 million to 911 million, sharper than 2014's fall of 3.71 million.
Shanghai and other southern cities are expected to experience biting cold until Saturday, but no transportation disruption is expected.