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"Cold air may arrive in northern parts of the Beijing-Tianjin-Hebei cluster on Thursday. Slow in speed, however, it will fail to quickly take away the pollutants. Most of the pollutants are expected to be cleared on Friday," the National Joint Research Center on Air Pollution Causes and Control said in a statement on Monday.

"China's civil aviation development has two important driving forces－opening more international airlines, which cannot be replaced by high-speed rail, and building more small and medium-sized regional airports in the southwest and northwest," said Li Xiaojin, a professor of aviation economics at Civil Aviation University in Tianjin.

"Cities such as Chengdu, Wuhan and Zhengzhou have all put forward plans to expand their urban rail transit systems to 500 km. The scale is larger than what Beijing and Shanghai planned during the 2008 Olympic Games and the Shanghai World Expo in 2010," Song said.

"China since has done an excellent job in improving children's health, building facilities such as kindergartens and children's palaces, promoting compulsory education and helping homeless children," she said.

"China's opening-up policy is beneficial to all countries including Cambodia," he noted.