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High intensity measurements of water-soluble organic carbon (WSOC) in PM2.5 were conducted at Yellow River Delta (YRD),North China,from 29 May to 1 July,2013.On average,concentration of WSOC was 3.09 μg/m3 with a relative high WSOC/OC mass ratio (56.39%),implying organic aerosol in YRD was aged.WSOC concentration in day time was obviously higher than night time,which was mainly attributed to the decrease of source emission.