Characteristics of carbonaceous aerosol in PM2.5: Pearl Delta River region, China

Hong HUANG, Kin Fai HO, S. C. LEE, Po Keung Eric TSANG, Steven Sai Hang HO, Changwei ZOU, S. C. ZOU, Junji CAO, H. M. XU

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Simultaneous measurements of atmospheric organic carbon (OC), elemental carbon (EC) and water-soluble organic carbon (WSOC) were made at four sampling sites, namely Guangzhou (GZ), Zhaoqing (ZQ), PolyU Campus (PU) and Hok Tsui (HT), in the Pearl River Delta (PRD) region between 14 August 2006 and 28 August 2007. The highest concentrations of total carbon (TC) were found at the medium-scale roadside site (PU) and the lowest were found at the regional-scale site (HT). Among the four sampling sites, the average WSOC at ZQ showed the highest concentrations, while the lowest were seen at HT. OC and EC concentrations revealed spring/summer minima and autumn/winter maxima at all sites except PU, which had a consistently high EC concentration all over the year. The highest WSOC/OC ratio was found at ZQ with an average of 0.41, suggesting that the OC was more oxidized in the atmosphere of the semi-rural site. The lowest WSOC/OC was found at the roadside site of PU. Moreover, the WSOC/OC ratio increased in autumn, when the photochemical reactions are the most active in the PRD region. This can be attributed to aging and atmospheric processing of the organic compounds during their transportation, or to the formation of secondary organic aerosol (SOA). Average annual secondary organic carbon (SOC) concentrations in PM2.5 were estimated to be 2.2 and 3.5 μg m-3 for GZ and ZQ, comprising 33.5% and 42.8% of the corresponding OC concentrations, respectively. The results indicate that SOC are significant in the PRD region, and their formation mostly occur within the region. Copyright © 2011 Published by Elsevier B.V.
Original languageEnglish
Pages (from-to)227-236
JournalAtmospheric Research
Publication statusPublished - Feb 2012


Huang, H., Ho, K. F., Lee, S. C., Tsang, P. K., Ho, S. S. H., Zou, C. W., et al. (2012). Characteristics of carbonaceous aerosol in PM2.5: Pearl Delta River region, China. Atmospheric Research, 104-105, 227-236. doi: 10.1016/j.atmosres.2011.10.016


  • PM2.5
  • Organic carbon
  • Elemental carbon
  • Water-soluble organic carbon (WSOC)
  • Pearl River Delta


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