Smog blanketed Beijing and parts of northern China on Sunday, disrupting many passengers' plans of returning to work after the Spring Festival holiday.
China's capital of Beijing has set a target of completing environmentally friendly renovations on all its coal-fired heating furnaces by 2015.
Sales of fireworks in Beijing have dropped significantly this Spring Festival holiday season, as residents have exercised restraint in order to ward off smog.
The State Council, China's cabinet, on Wednesday issued a timetable for its program to upgrade fuel quality, with strict standards to be promoted nationwide before 2017.
A total of 4,000 tons of pollutants are estimated to be in the air in urban areas of Beijing on serious pollution days.
Emissions from motor vehicles, coal-burning and cooking contributed to the dense smogs in Beijing in January, according to research results issued Sunday.
Ministry of Foreign Affairs of the PRC
Ministry of Science and Technology of the PRC
Ministry of Industry and Information Technology of the PRC
Ministry of Culture of the PRC
National Tourism Administration of the PRC
China Council for the Promotion of International Trade
People’s Government of Liaoning province
China-Northeast Asia Expo (Expo Affairs Bureau of Jilin province)
Jilin Development and Reform Commission
Jilin Industry and Information Technology Dept
Jilin Science and Technology Dept
Jilin Foreign and Overseas Chinese Affairs Office
Jilin Economic and Technical Cooperation Bureau
Jilin Council for the Promotion of International Trade