[Distribution characteristics of pollution gases and water soluble ion in aerosol during the Asian Youth Games of Nanjing, China].

Water soluble ions were observed by an Andersen cascade impactor(Andersen) and ion chromatography in Nanjing during the Asian Youth Games( AYG),and PM2. 5,NO,NO2,O3 and CO were observed by ray β dust instrument,EMS pollution gases monitoring system. Concentrations of PM2. 5,NO2,O3 and CO,were 37. 0,19. 3,48. 1 and 0. 7 × 103μg·m- 3during the AYG period,26. 0%,42. 6%,36. 1% and 46. 1% lower than the value before the AYG period. During the AYG period,the main watersoluble ions in PM2. 1were Na+,NH+4,Ca2 +and SO2-4,accounting for 80.6%; the main water-soluble ions in PM2. 1-10 were Na+,Ca2 +,NO-3and SO2-4,accounting for 77.9%. The spectral distribution of Ca2 +,Mg2 +and NO-3were bimodal during the AYG period,other ions were three models. Before and after the AYG period,all ions were three models. From NO-3/SO2-4,we can judge SO2 and NOxmainly come from the mobile source before and after the AYG period,from stationary sources during the AYG period.