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Concentrations of organic carbon (OC) and element carbon (EC) in PM2.5 in the urban and rural areas of Beijing were determined and their sources were qualitatively discussed. PM2.5 samples were collected at five sites of Beijing during summers and winters of 2001 and 2002 and spring of 2003. Daily average 10.7+/-3.6 and 5.7+/-2.9μgm -3 in summer and 36.7+/-19.4 and 15.2+/-11.1μgm ...
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