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Physicochemical properties of aerosol particles were studied at Mt.Lu,an elevated site(115°59′E,29°35′N,1,165 m)within the acid precipitation area.Northeast winds transport copious amounts of air pollutants and water vapor from the Yangtze River Delta into this acid precipitation area.NH4+and SO4 2-are the dominant ions in PM2.5 and determine aerosol acidity.Individual particle analysis shows abundant S-rich and metals(i.e.Fe-,Zn-,Mn-,and Pb-rich)particles.Unlike aerosol particles in North China and urban areas,there are little soot and mineral particles at Mt.Lu.Lack of mineral particles contributed to the higher acidity in precipitation in the research area.Nano-sized spherical metal particles were observed to be embedded in 37%of S-rich particles.