AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
Contribution of Open Burning of Agricultural Residues to PM2.5 in Suburban Tokyo: PM Mass and Oxidative Potential
AKIHIRO FUSHIMI, Ana Villalobos, Akinori Takami, Kiyoshi Tanabe, James Schauer, National Institute for Environmental Studies
Abstract Number: 715 Working Group: Linking Aerosol Oxidative Potential with Chemical Composition and Biological Endpoints
Abstract Oxidative potential of freshly emitted open burning aerosol is in the lower range of vehicle exhaust and atmosphere1. Therefore, the contribution of open burning may be relatively small to the oxidative potential of atmospheric particles. In this study, fine atmospheric particles (PM2.5) in suburban Tokyo (Tsukuba), Japan were collected for 24 h every week over the course of a full year (2012–2013) to estimate the source contributions with a focus on open burning of agricultural residues. Elemental carbon, organic carbon, water-soluble organic carbon, inorganic ionic species, and organic markers were measured. Particulate mass, elements, and oxidative potential using an in-vitro rat alveolar macrophage reactive oxygen species (ROS) assay were also measured. Chemical mass balance analysis using the organic marker data suggested that vehicles, open burning, and cooking were the most important primary sources and secondary organic carbon also had large contribution to organic aerosols. The measured oxidative potential was higher in spring and summer, and was higher than the reported values in Los Angeles but lower than Milan. Secondary aerosol and emissions from residual oil burning (including ship) were most strongly associated with PM2.5 oxidative potential as compared to source contributions from open burning.
1. Fushimi A., Saitoh K., Hayashi K., Ono K., Fujitani Y., Villalobos A.M., Shelton B.R., Takami A., Tanabe K., Schauer J.J. (2017) Chemical characterization and oxidative potential of particles emitted from open burning of cereal straws and rice husk under flaming and smoldering conditions, Atmospheric Environment, 163, 118–127.