Ambient temperature has substantial impacts on vehicle emissions,but the impacts may differ between traditional and alcohol gasolines.The objective of this study was to investigate the effects of temperature on gaseous and particulate emissions with both traditional and alcohol gasoline.Regulated gaseous,particle mass (PM),particle number (PN) and black carbon (BC) emissions from typical passenger vehicles were separately quantified with gasoline,El0 (10％ ethanol and 90％ gasoline by volume) and M15 (15％ methanol and 85％ gasoline by volume) at both 30℃ and-7℃.The particulate emissions with all fuels increased significantly with decreased temperature.The PM emissions with El0 were only 48.0％-50.7％ of those with gasoline at 30℃ but increased to 59.2％-79.4％ at-7℃.The PM emissions with M15 were comparable to those with gasoline at 30℃,but at7℃,the average PM emissions were higher than those with gasoline.The variation trend of PN emissions was similar to that of PM emissions with changes in the fuel and temperature.At 30℃,the BC emissions were lower with E 10 and M 15 than with gasoline in most cases,but El 0 and M15 might emit more BC than gasoline at-7℃,especially M15.The results of the transient PN and BC emission rates show that particulate emissions were dominated mainly by those emitted during the cold-start moment.Overall,the particulate emissions with El0 and M15 were more easily affected by ambient temperature,and the advantages of E10 and M15 in controlling particulate emissions declined as the ambient temperature decreased.