The professionalism of Chinese internal experts has always been questionable;the latest example is the dramatic modifications of haze data. According to the Chinese experts, the previous data is unfavorable toward vehicles usage because it contains more than 30% of pollution that generated by vehicles usage. However, the revised data showed that pollution caused by vehicles has been modified to around 4%. The new data causes great confusion and doubts because China's big cities such as Beijing, Shanghai, Nanjing, Tianjin and Guangzhou have implemented restrictive measures on vehicle purchase according to the previous released data.