Journal
ENVIRONMENTAL POLLUTION
Volume 286, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2021.117280
Keywords
Long range transport; Size-segregated ion components; Size-segregated elements; Urban aerosol; Contributions to aerosols in Tokyo; Urban site
Categories
Funding
- Steel Foundation for Environmental Protection Technology
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The study assessed the contribution of transboundary air pollutants transported from China to Tokyo using the Pb-(0.5<1)/Cu-(2.5<10) index. Results showed that the western part of Japan is affected more by these pollutants than the eastern part. The main source of Cu was identified as braking abrasion from cars at a local scale.
We assessed the contribution of transboundary air pollutants (TAPs) transported from China to Tokyo using the Pb-(0.5< 1)/Cu-(2.5< 10) index. We conducted intensive observations over four seasons during 2014-2015 and analyzed ionic components and thirteen elements in size-segregated aerosols collected at the top of a 30-m-high tower in a hilly forested area of the Field Museum Tamakyuryo (FM Tama), in a western suburb of Tokyo. In order to evaluate if the Pb-(0.5< 1)/Cu-(2.5< 10) ratio can be applied in Tokyo as the megacity, the annual average concentration of Pb at Cape Hedo, Kumamoto city, on the west side of Japan, was higher than that of Pb at Tokyo, on the east side; this result indicates that TAPs affect western Japan more than eastern Japan. We inferred the main source of Cu to be braking abrasion from cars at local scale on the basis of its enrichment factor and size distribution. From the Pb-(0.5< 1)/Cu-(2.5< 10) ratio and sulfate concentration, we inferred that the highest contribution of TAPs to the total mass concentration in Tokyo occurred in spring, when TAPs accounted for 55%, 72%, and 53% of the total mass concentration in the 0.1 < Dp < 0.5, 0.5 < Dp < 1, and 1 < Dp < 2.5 fractions, respectively. These results can contribute to assessment of TAPs in Tokyo.
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