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A monitoring program for PM 2.5 had been performed at two urban monitoring stations in Hong Kong from November 2000 to February 2001 and June 2001 to August 2001. PM 2.5 samples were collected once every 6 days at PolyU and KT stations with the sampling duration of 24-h. A sum of 25 chemical species in PM 2.5 were determined and selected for receptor models. Enrichment factors...
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