Chemical characterization, toxicity and source apportionment of respirable atmospheric particles in Hong Kong (ECF Project No. 3/97: The Environmental Health Impact of Respirable Atmospheric Particles (PM-2.5) in Hong Kong)
Hsiao, W. L. Wendy
Kester, Dana R.
Wan, Terence See-Ming
|Summary||In this report, findings on the respirable suspended particulates (RSP) in Hong Kong are presented. RSP in this context is defined as atmospheric particulates smaller than 10 μm in aerodynamic diameter (PM10). Atmospheric particles in four different size cuts were collected in this study: <0.49, 0.49-0.95, 0.95-2.5, and 2.5-10 μm. PM2.5 (smaller than 2.5 μm in aerodynamic diameter) and PM10 were also collected. The detailed chemical (metals and solvent-extractable organic compounds) characteristics and seasonal variations of these categories of particles were studied. The toxicity of the PM2.5 and PM10 were also measured. The sources of these aerosols were apportioned using several different methods including Chemical Mass Balance and Conventional Factor Analysis, and correlations between the tracers of the inorganic and organic species were determined. The dry and wet deposition fluxes were determined from the corresponding deposition measurements directly and by modeling using atmospheric aerosol concentration measurements. Inorganic and organic characterization of the dry and wet deposition samples were conducted. The results of this study enhance the understanding of the particulate behavior and they can be used in future health impact studies.|