Vacuum bottle in-situ sampling and single particle aerosol mass spectrometry method were used to study the composition and source spectrum of fine particle emission from leading brand gasoline and diesel vehicles. The results showed that the source spectrum characteristics of gasoline and diesel vehicles were similar as a whole, the mean similarity was 0.88, both with carbon and calcium as the main characteristic components. Sulfate features were obvious in the characteristic of source spectrum of some diesel vehicles, OC features were prominent in carbon components. However, phosphate features were relatively prominent in the characteristics of source spectrum of gasoline vehicles, and short chain element carbon accounted for a high proportion of carbon components. Based on the actual observation of road by the source spectrum, combined with the analysis of wind speed, wind direction and other meteorological parameters, the mobile source corresponding to the observation points accounted for 33.5% from Feb. 1th to 24th, 2021, of which gasoline vehicles contributed 21.0% and diesel vehicles contributed 12.5%. |