According to the traffic management detachment of the Public Security Bureau of Hohhot City, Inner Mongolia Autonomous Region, according to the requirements of energy conservation and emission reduction and the responsibility of air pollution control in Hohhot City, in 2014, the traffic control detachment of the Public Security Bureau of Hohhot City took the lead, and the traffic police brigade of each jurisdiction and The environmental protection departments cooperated to further strengthen the city's motor vehicle exhaust emission control work. At least 3,000 “yellow-standard vehicles” were eliminated during the year, and all “yellow-standard vehicles” within the city were planned to be eliminated in 2017.
By the end of 2013, the number of motor vehicles in Hohhot had reached nearly 700,000, and the number of “yellow-label vehicles” was about 38,000. Previously, Hohhot mainly implemented traffic control on the “Yellow Label Vehicle”, that is, it was prohibited to drive within the Second Ring Road from 7:30 to 21:00.