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To investigate the origins, other than fossil fuel combustion and biomass burning, of urban carbonaceosus aerosols, we studied the fine (PM 2.5 ) aerosols collected in Guiyang, Southwest China in winter (December 10-23) 2012 for organic carbon (OC), elemental carbon (EC) and water-soluble diacids, oxoacids, α-dicarbonyls and fatty acids as well as inorganic ions. Oxalic acid (C 2 ) found to be the most abundant diacid species followed by succinic (C 4 ) and terephthalic (t-Ph) acids,doi:10.1088/2515-7620/ab34eb fatcat:ky4wvwuopfezredghck2id5id4