Acidity and concentrations of ionic species of PM2.5 in Hong Kong

摘要: Abstract The strong acidity and the concentrations of ammonium, sodium, sulfate, nitrate chloride in PM2.5 Hong Kong were measured using a Harvard honeycomb denuder/filter-pack system. role atmospheric mixing height variation species was investigated contribution long-range transport to ambient aerosols quantitatively determined. average spring, summer, autumn winter 2000, spring 2001 49(23–92), 27(11–52), 97(71–145), 45(26–57), 103(78–167) nmol/m3, respectively. Simulations aerosol inorganic model (AIM2) revealed that situ only minor fraction (23–39%) because presence bisulfate ions. correlated with large difference between relative humidity estimated deliquescence aerosols. In equivalent concentrations, acidity, ammonium sulfate accounted for 16% (9–21%), 31% (26–39%) 42% (40–45%) water-soluble species, Analysis air mass trajectories showed through East/South China Sea (marine) mainland (continental) possible. When under influence marine masses, correlation height. Continental found increase by 49–383% 33–302%, total, about 40% this study from continental masses. However, masses on concentration not obvious.