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

ABSTRACT

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 ß 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 x 10(3) µg x m(-3) during 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 water-soluble ions in PM2.1 were Na(+), NH4(+) , Ca(2+) and SO4(2-), accounting for 80.6%; the main water-soluble ions in PM2.1-10 were Na(+), Ca(2+), NO3(-) and SO4(2-), accounting for 77.9%. The spectral distribution of Ca(2+), Mg(2+) and NO3(-) were bimodal during the AYG period, other ions were three models. Before and after the AYG period, all ions were three models. From NO3(-)/SO4(2-), we can judge SO2 and NO(x) mainly come from the mobile source before and after the AYG period, from stationary sources during the AYG period.