Abstract
In order to shed light on the atmospheric fine particulate matter (PM2.5) pollution of the roadside atmosphere in the Tokyo metropolitan area, we carried out high time-resolution sampling of PM2.5 at the Ikegami-Shincho crossing in Kawasaki City, Kanagawa Prefecture, Japan at November 2003. The PM2.5 sample (spot shaped sample) was collected every hour on an ultra-fine membrane PTFE tape-filter by a beta-ray attenuation PM2.5 mass monitor Elemental composition (22 elements) of the PM2.5 spot sample was analyzed by particle induced x-ray emission (PIXE) at the Nishina Memorial Cyclotron Center, Japan Radioisotope Association. Ionic species (seven ions) in the PM2.5 spot sample was determined using ion chromatography. The analytical results are valuable for the physicochemical characterization of PM2.5 in roadside atmosphere, enabling evaluation of various roadside emission sources and atmospheric processes. When information on organic and elemental carbons was added to these composition data and the component ratio was examined, for average composition of PM2.5 in 2 day, organic carbon was 27%, elemental carbon was 43%, elements was 5%, ions was 25%. Results from the Positive Matrix Factorization (PMF) analysis suggested that sufficient part of the PM2.5 on the roadside was derived from traffic related particles and atmospheric secondary formed particles.
