Since heavy smog stays continually in northern China, the public is increasingly concerned about air pollution, Some netizens even express their anger over the pollution levels. It's extremely urgent to control air pollution. Many Chinese cities have imposed limits on car purchases, hoping to case the traffic jam, and meanwhile control air pollution. The Chinese government is launching a long-term plan to control industries which cause heavy pollution. It is also spending an additional five billion yuan on the improvement of air quality in the northern region.