In 2011，we conducted a survey on the public’s risk perception of air pollution in Beijing. The results indicated that the majority of citizens believed that the air quality in Beijing is between good and medium level；among all the risk items related with air pollution，global warming was considered to be the highest risk factor，and the unpleasant odor was the lowest one. But under the different influence factors，there were small differences in risk perception among each group. We also found that comparing with those who never smoked and smoked regularly，occasional smokers had the lowest level of risk perception on cigarette smog. Otherwise，when regarding the evaluation towards hazard of car exhaust on themselves，natural environment and social & economic development，car owners perceived less than people without car.