Environmental Chemistry Lab, Department of Applied Chemistry,
Faculty of Science and Technology, Keio University
Led by Tomoaki OKUDA, Ph.D.

Research

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Peer Reviewed Publications

Publication List (Peer Reviewed)

  1. 127. Chen, K., Jing, W., Shen, Z.X., Okuda, T. (2025) Comparative analysis of polycyclic aromatic sulfur heterocycles (PASHs) in PM2.5 from Xi’an, China and Yokohama, Japan: Pollution characteristics and source attribution, Asian Journal of Atmospheric Environment, in press. doi: .
  2. 126. Kuruma, Y., Sakurai, H., Okuda, T. (2025) Size distribution measurement of insoluble particles in PM2.5 dispersed in cell culture medium using aerosolization techniques, ACS Omega, 2025, 10, 43797-43807, doi: 10.1021/acsomega.5c04217.
  3. 125. Nakahira, Y., Otomo, D., Okuda, T., Onodera, A. (2025) Sub-toxic exposure to DEPs and PM2.5 impairs dendritic cell function through intracellular particle accumulation, Journal of Xenobiotics, 15 (5), 142, 16 pages, doi: 10.3390/jox15050142.
  4. 124. Hasegawa, S., Kan, Y., Honda, A., Okuda, T., Takano, H. (2025) Toxicological Assessments and Those Prescriptive Factors of PM2.5 in Saitama Prefecture Using Year-Round Ambient Samples, Journal of Japan Society for Atmospheric Environment, 60 (5), 76-86, doi:10.11298/taiki.60.76.
  5. 123. Iwata, A., Horwitz, S.G.M., Kurihara, K., Matsuki, A., Okuda, T. (2026) Variability of submicron ice-nucleating particles at urban and rural sites in Japan related to aerosol chemical components, Atmospheric Research, 327, 108386, 11 pages, doi: 10.1016/j.atmosres.2025.108386.
  6. 122. Mori, T., Matsuki, A., Iwata, A., Kamogawa, M., Komatsu, M., Hattori, H., Okuda, T. (2025) Characteristics of charge distributions of submicron atmospheric particles at Noto Peninsula, Japan, Atmospheric Environment, 360, 121411, 12 pages, doi: 10.1016/j.atmosenv.2025.121411.
  7. 121. Zhang, K., Honda, A., Sagawa, T., Miyasaka, N., Qiu, B., Ishikawa, R., Okuda, T., Kameda, T., Sadakane, K., Ichinose, T., Takano, H. (2025) Complement system is activated in acute inflammatory response to environmental particulates in the lungs, Ecotoxicology and Environmental Safety, 297, 118259, 15 pages, doi: 10.1016/j.ecoenv.2025.118259.
  8. 120. Jing, W., Nakano, K., Mitani, R., Shen, Z., Okuda, T. (2025) Variations in polycyclic aromatic hydrocarbons concentrations and their contribution to aerosol optical depth during the COVID-19 Outbreak: a study in Yokohama using generalized additive model, Atmospheric Pollution Research, 16 (8), 102547, 11 pages, doi: 10.1016/j.apr.2025.102547.
  9. 119. Mitani, R., bin Mohd Nor, M.A., Iinuma, T., Mori, T., Okuda, T. (2025) Numerical analysis of collision mechanism that causes particle tribocharging in dry powder inhaler, Asian Journal of Atmospheric Environment, 19, Article Number 1, 16 pages, doi: 10.1007/s44273-025-00049-0.
  10. 118. Lyu, Y., Zhang, Q., Tanzeglock, L., Tu, M., Mo, J., Okuda, T., Pagels, J., Wahlström, J. (2025) Mapping of friction, wear and particle emissions from high-speed train brakes. Wear, 572-573, 206027, 10 pages, doi: 10.1016/j.wear.2025.206027.
  11. 117. Saito, M., Katayama, Y., Naruse, A., Ruan, P., Murakami, M., Okuda, T., Yasutaka, T., Naito, W., Tsubokura, M., Imoto, S. (2025) Effects of inbound attendees of a mass gathering event on the COVID-19 epidemic using individual-based simulations. PLOS One, 20 (4), e0321288, 11 pages, doi: 10.1371/journal.pone.0321288.
  12. 116. Ishihara, N., Tanaka, M., Namba, K., Kawano, S., Nishimura, S., Nezu, N., Nakane, T., Oguro, A., Okuda, T., Itoh, K., Nabetani, Y., Ishihara, Y. (2025) Long-term exposure to urban particulate matter exacerbates mortality after ischemic stroke in mice. Journal of Toxicological Sciences, 50 (3), 147-159, doi: 10.2131/jts.50.147.
  13. 115. Onishi, K., Yumimoto, K., Okuda, T., Fukuike, A., Maki, T., Nojima, M., Shinoda, M., Nakayama, T., Kurozawa, Y., Yamagata, Z., Kurosaki, Y. (2024) Transboundary air pollution in coastal urban area in Japan: Transport model and positive matrix factorization analysis for SPM-PM2.5 and PM2.5, Urban Climate, 102237, 15 pages, doi: 10.1016/j.uclim.2024.102237.
  14. 114. Mitani, R., Yamanaka, H., Ishigaki, Y., Nakayama, D., Sakamoto, M., Watanabe, C., Mori, T., Okuda, T. (2024) Bacteriostatic effect of indoor air quality management with low-concentration gaseous chlorine dioxide on fungal growth, Asian Journal of Atmospheric Environment, 18, Article Number 24, 9 pages, doi: 10.1007/s44273-024-00047-8.
  15. 113. Sagawa, T., Ichinose, T., Honda, A., Kuroda, E., Ishikawa, R., Miyasaka, N., Nagao, M., Okuda, T., Kawahito, Y., Takano, H. (2024) Acceleration of acute lung inflammation by IL-1α released through cell death of alveolar macrophages upon phagocytosis of fine Asian sand dust particles, Environment International, 194, 109178, 15 pages, doi: 10.1016/j.envint.2024.109178.
  16. 112. Owokoniran, O.H., Honda, A., Ichinose, T., Ishikawa, R., Nagao, M., Miyasaka, N., Wang, Z., Takai, S., Omori, I., Zhang, K., Liu, W., Higaki, Y., Kameda, T., Matsuda, T., Fujiwara, T., Okuda, T., Takano, H. (2024) Co-exposure of ferruginous components of subway particles with lipopolysaccharide impairs vascular function: A comparative study with ambient particulate matter, Ecotoxicology and Environmental Safety, 288, 117356, 15 pages, doi: 10.1016/j.ecoenv.2024.117356.
  17. 111. Ishihara, Y., Kajino, M., Iwamoto, Y., Nakane, T., Nabetani, Y., Okuda, T., Kono, M., Okochi, H. (2024) Impact of artificial sunlight aging on the respiratory effects of polyethylene terephthalate microplastics through degradation-mediated terephthalic acid release in male mice. Toxicological Sciences, 203 (2), 242-252, doi: 10.1093/toxsci/kfae135.
  18. 110. Kono, M., Ishihara, N., Nakane, T., Nabetani, Y., Kajino, M., Okuda, T., Hayashi, M., Koriyama, C., Vogel, C.F.A., Tsuji, M., Ishihara, Y. (2024) Enhancement of keratinocyte survival and migration elicited by interleukin 24 upregulation in dermal microvascular endothelium upon welding-fume exposure. Journal of Toxicology and Environmental Health, Part A, 1-19, doi: 10.1080/15287394.2024.2372403.
  19. 109. Watanabe, H., Honda, A., Ichinose, T., Ishikawa, R., Miyasaka, N., Nagao, M., Wang, Z., Owokoniran, O.H., Qiu, B., Higaki, Y., Liu, W., Okuda, T., Matsuda, T., Takano, H. (2024) Ferruginous components of particulate matters in subway environments, α-Fe2O3 or Fe3O4, exacerbates allergies, Environmental Pollution, 355, 124195, 12 pages, doi: 10.1016/j.envpol.2024.124195.
  20. 108. Kumata, H., Uchida, M., Saha, M., Saitoh, S., Mantoku, K., Kobayashi, T., Okuda, T., Nakajima, F., Hatakeyama, S., Takada, H. (2024) Source apportionment of atmospheric and sedimentary PAHs from Kolkata, India using compound-class-specific radiocarbon analysis (CCSRA), Radiocarbon, 66 (5), 892-903, doi:10.1017/RDC.2024.66 .
  21. 107. Yasutaka, T., Onishi, M., Naito, W., Bando, Y., Okuda, T., Murakami, M. (2024) Maximum proportion of masks worn: Collaborative efforts in Japanese professional football, Journal of Infection and Public Health, 17 (S1), 8-10, doi: 10.1016/j.jiph.2023.03.009.
  22. 106. Mori, T., Ishii, Y., Iwata, A., Okuda, T. (2024) Seasonal charge distributions of submicron atmospheric particles in Yokohama, Japan, Atmospheric Environment, 324, 120421, 13 pages, doi: 10.1016/j.atmosenv.2024.120421.
  23. 105. Nishita-Hara, C., Nakano, K., Iwata, A., bin Mohd Nor, M.A., Mori, T., Youn, H., Okuda, T. (2024) Development of an openable small cyclone for atmospheric particulate matter sampling for toxicological experiments. Aerosol Science and Technology, 58 (6), 681-693, doi: 10.1080/02786826.2024.2322680.
  24. 104. Mori, T., Iwata, A., Tabata, R., Okuda, T. (2024) Key factors controlling number concentrations of non-charged particles: an experimental study, Aerosol and Air Quality Research, 24 (4), 220382, 14 pages, doi: 10.4209/aaqr.220382.
  25. 103. Yasutaka, T., Fujita, T., Naito, W., Onishi, M., Murakami, M., Imoto, S., Okuda, T.(2024) Infection Risk Assessment of COVID-19 at Graduation and Entrance Ceremonies, 33 (4), 167-178 (in Japanese), doi: 10.11447/jjra.O-23-001.
  26. 102. Kajino, M., Kayaba, S., Ishihara, Y., Iwamoto, Y., Okuda, T., Okochi, H. (2024) Numerical simulation of IL-8-based relative inflammation potentials of aerosol particles from vehicle exhaust and non-exhaust emission sources in Japan, Atmospheric Environment: X, 21, 100237, 16 pages, doi: 10.1016/j.aeaoa.2024.100237.
  27. 101. Kono, M., Takaishi, M., Okuda, T., Fujihara, M., Noguchi, S., Ishihara, Y. (2024) A simple air–liquid interface exposure system for exposing cultured human 3D epidermis and cornea to PM2.5 collected through cyclonic separation. Journal of Toxicological Sciences, 49 (2), 61-68, doi: 10.2131/jts.49.61.
  28. 100. Okamoto, T., Iwata, A., Yamanaka, H., Ogane, K., Mori, T., Honda, A., Takano, H., Okuda, T. (2024). Characteristic Fe and Cu Compounds in Particulate Matter from Subway Premises in Japan and their Potential Biological Effects. Aerosol and Air Quality Research, 24 (3), 230156, 16 pages, doi: 10.4209/aaqr.230156.
  29. 99. Hagino, H, Iwata, A, Okuda, T. (2024) Iron oxide and hydroxide speciation in emissions of brake wear particles from different friction materials using an X-ray absorption fine structure. Atmosphere 15 (1), 49, 14 pages, doi: 10.3390/atmos15010049.
  30. 98. Uehara, N., Komase, Y., Kunisima, H., Okuda, T. (2024) Study on droplet during on lung function test and inhalation guidance under the epidemic of COVID-19, The Journal of the Japan Society for Respiratory Care and Rehabilitation, 32 (2), 1-5 (in Japanese), doi: 10.15032/jsrcr.21-46.
  31. 97. Shinke, Y., Mori, T., Iwata, A., bin Mohd Nor, M.A., Kurosawa, K., Inagaki, M., Sekimoto, S., Takamiya, K., Oki, Y., Ohtsuki, T., Igarashi, Y., Okuda, T. (2023) Technique for estimating the charge number of individual radioactive particles using Kelvin probe force microscopy, Aerosol Science and Technology, 57 (8), 758-768, doi: 10.1080/02786826.2023.2221726.
  32. 96. Jing, W., Nakano, K., Shen, Z., Okuda, T. (2023) Optimization of the QuEChERS extraction method to determine Polycyclic Aromatic Hydrocarbons (PAHs) in powder aerosol particles collected by cyclone, Environmental Technology & Innovation, 31, 103141, 14 pages, doi:10.1016/j.eti.2023.103141.
  33. 95. Youn, H., Miki, K., Iwata, A., Okuda, T. (2023) Estimation of particle size distributions in the atmosphere – analysis of Fe and Ca particles as the representative examples, Asian Journal of Atmospheric Environment, 17, 2, 12 pages, doi:10.1007/s44273-023-00002-z.
  34. 94. Yoshii, T., Nakano, K., Okuda, T., Citterio, D., Hiruta, Y. (2023) Evaluation of separation performance for eggshell-based reversed-phase HPLC columns by controlling particle size and application in quantitative therapeutic drug monitoring, Analytical Methods, 15, 1790-1796, doi:10.1039/d3ay00219e.
  35. 93. Tanaka, M., Okuda, T., Itoh, K., Oguro, A., Fujii-Kuriyama, Y., Nabetani, Y., Yamamoto, M., Vogel, C.F.A., N., Ishihara, Y. (2023) Polycyclic aromatic hydrocarbons in urban particle matter exacerbate movement disorder after ischemic stroke via potentiation of neuroinflammation, Particle and Fibre Toxicology, 20, 6, 14 pages, doi:10.1186/s12989-023-00517-x.
  36. 92. Honda, A., Inoue, K., Tamura, S., Tanaka, M., Wang, Z., Tanaka, T., Hirai, S., Okuda, T., Ueda, K., Takano, H. (2022) Effects of streamer discharge on PM2.5 containing endotoxins and polyaromatic hydrocarbons and their biological responses in vitro. International Journal of Molecular Sciences, 23, 15891, 11 pages, doi:10.3390/ijms232415891.
  37. 91. Alimov, Z.B., Youn, H., Iwata, A., Nakano, K., Okamoto, T., Sasaki, A., Katori, T., Okuda, T. (2022) Comparison of the chemical characteristics and toxicity of PM2.5 collected using different sizes of cyclones, Asian Journal of Atmospheric Environment, accepted.
  38. 90. Kono, M., Okuda, T., Takaishi, M., Ikeda, H., Ishihara, N., Ishihara, Y. (2022) Leaf extracts from Camellia sinensis and Argania spinosa suppress oxidative stress and chemokine release in human 3-dimensional cultured epidermis exposed to PM2.5 collected with cyclonic separation, Fundamental Toxicological Sciences, in press.
  39. 89. Kono, M., Okuda, T., Ishihara, N., Hagino, H., Tani, Y., Okochi, H., Tokoro, C., Takaishi, M., Ikeda, H., Ishihara, Y. (2022) Chemokine expression in human 3-dimensional cultured epidermis exposed to PM2.5 collected by cyclonic separation, Toxicological Research, in press, doi:10.1007/s43188-022-00142-4.
  40. 88. Jing, W., Saito, K., Okamoto, T., Saito, H., Sugimoto, K., Nishita-Hara, C., Hara, K., Hayashi, M., Hasegawa, S., Okuda, T. (2022) Characterization of elemental composition and valence state of cyclone-collected aerosol particles using EDXRF and XAFS at three sites in Japan, Asian Journal of Atmospheric Environment, in press., .
  41. 87. Ishihara, N., Okuda, T., Hagino, H., Oguro, A., Tani, Y., Okochi, H., Tokoro, C., Fujii-Kuriyama, Y., Itoh, K., Vogel, C.F.A., Ishihara, Y. (2022) Involvement of polycyclic aromatic hydrocarbons and endotoxin in macrophage expression of interleukin-33 induced by exposure to particulate matter, Journal of Toxicological Sciences, in press, .
  42. 86. Kurihara, K., Iwata, A., Murray Horwitz, S.G., Ogane, K., Sugioka, T., Matsuki, A., Okuda, T. (2022) Contribution of physical and chemical properties to dithiothreitol-measured oxidative potentials of atmospheric aerosol aarticles at urban and rural sites in Japan, Atmosphere, 13 (2), 319, doi:10.3390/atmos13020319.
  43. 85. Murakami, M., Yasutaka, T., Onishi, M., Naito, W., Shinohara, N., Okuda, T., Fujii, K., Katayama, K., Imoto, S. (2021) Living with COVID-19: mass gatherings and minimizing risk, QJM: An International Journal of Medicine, 114 (7), 437-439, doi:10.1093/qjmed/hcab163.
  44. 84. Sugimoto, K., Okuda, T., Hasegawa, S., Nishita-Hara, C., Hara, K., Hayashi, M (2021) Examination of the Oxidation Mechanism of Ascorbic Acid When Measuring Oxidative Potential Using the Ascorbic Acid Assay, Journal of Japan Society for Atmospheric Environment, 56 (5), 96-107 (in Japanese), doi:10.11298/taiki.56.96.
  45. 83. Kurihara, K., Iwata, A., Kiriya, M., Yoshino, A., Takami, A., Matsuki, A., Nishita-Hara, C., Hara, K., Hayashi, M., Kaneyasu, N., Seto, T., Fujitani, Y., Funato, K., Inoue, K., Okuda, T. (2021) Lung deposited surface area of atmospheric aerosol particles at three observatories in Japan, Atmospheric Environment, 262, 118597, doi:10.1016/j.atmosenv.2021.118597.
  46. 82. Okuda, T., Murakami, M., Naito, W., Shinohara, N., Fujii, K. (2021) Interpretation of Carbon Dioxide Concentration Values for Applying It as a Management Index of Infection Control, Japanese Journal of Risk Analysis, Advance online publication,in Japanese, doi:10.11447/jjra.SRA-0364.
  47. 81. Kajino, M., Hagino, H., Fujitani, Y., Morikawa, T., Fukui, T., Onishi, K., Okuda, T., Igarashi, Y. (2021) Simulation of the transition metal-based cumulative oxidative potential in East Asia and its emission sources in Japan, Scientific Reports, 11, 6550, doi:10.1038/s41598-021-85894-z.
  48. 80. Murakami, M., Miura, F., Kitajima, M., Fujii, K., Yasutaka, T., Iwasaki, Y., Ono, K., Shimazu, Y., Sorano, S., Okuda, T., Ozaki, A., Katayama, K., Nishikawa, Y., Kobashi, Y., Sawano, T., Abe, T., Saito, M., Tsubokura, M., Naito, W., Imoto, S. (2021) COVID-19 risk assessment at the opening ceremony of the Tokyo 2020 Olympic Games, Microbial Risk Analysis, in press, doi:10.1016/j.mran.2021.100162.
  49. 79. Alimov, Z.B., Kusakari, H., Okuda, T. (2021) Development of a low-cost simultaneous low volume air sampler controlled with sonic venturi, Asian Journal of Atmospheric Environment, accepted.
  50. 78. Ko, R., Hayashi, M., Tanaka, M., Okuda, T., Nishita-Hara, C., Ozaki, H., Uchio, E. (2021) Effects of ambient particulate matter on a reconstructed human corneal epithelial model, Scientific Reports, accepted.
  51. 77. Sagawa, T., Tsujikawa, T., Honda, A., Miyasaka, N., Tanaka, M., Kida, T., Hasegawa, K., Okuda, T., Kawahito, Y., Takano, H. (2021) Exposure to particulate matter upregulates ACE2 and TMPRSS2 expression in the murine lung, Environmental Research, accepted, 10.1016/j.envres.2021.110722.
  52. 76. Honda, A., Okuda, T., Nagao, M., Miyasaka, N., Tanaka, M., Takano, H. (2021) PM2.5 collected using cyclonic separation causes stronger biological responses than that collected using a conventional filtration method, Environmental Research, in press, 10.1016/j.envres.2020.110490.
  53. 75. Patel, P., Aggarwal, S.G., Tsai, C.-J., Okuda, T. (2021) Theoretical and Field Evaluation of a PM2.5 High-Volume Impactor Inlet Design, Atmospheric Environment, 244, 117811, doi:10.1016/j.atmosenv.2020.117811.
  54. 74. Kajino, M., Hagino, H., Fujitani, Y., Morikawa, T., Fukui, T., Onishi, K., Okuda, T., Kajikawa, T., Igarashi, Y. (2020) Modeling Transition Metals in East Asia and Japan and Its Emission Sources, GeoHealth, 4 (9), doi:10.1029/2020GH000259.
  55. 73. He, Y., Gu, Z., Lu, W., Zhang, L., Zhang, D., Okuda, T., Yu, C.W. (2020) Charging states on atmospheric aerosol particles affected by meteorological conditions, Particuology, 52, 1-9, doi:10.1016/j.partic.2019.12.007.
  56. 72. Saito, K., Okuda, T., Hasegawa, S., Nishita-Hara, C., Hara, K., Hayashi, M.，Chemical Speciation of Chromium in Atmospheric Particulate Matter Collected with Cyclone by XAFS Method, Journal of Japan Society for Atmospheric Environment (in Japanese), accepted.
  57. 71. Chowdhury, P.H., Honda, A., Ito, S., Okano, H., Onishi, T., Higashihara, M., Okuda, T., Tanaka, T., Hirai, S., Takano, H. (2019) Effects of ambient PM2.5 collected from Asian cities using cyclone technique on human airway epithelial cells, Aerosol and Air Quality Research, 19 (8), 1808-1819, .
  58. 70. Fujii, Y., Huboyo, H.S., Tohno, S., Okuda, T., Syafrudin (2019) Chemical speciation of water-soluble ionic components in PM2.5 derived from peatland fires in Sumatra Island, Atmospheric Pollution Research, 10 (4), 1260-1266, .
  59. 69. Okuda, T., Enomoto, T. (2019) Characteristics of Nickel and Elemental Composition of Aerosols in New Caledonia, Earozoru Kenkyu, 34 (1), 29-34, in Japanese.
  60. 68. Iwata, A., Fujioka, K., Yonemichi, T., Fukagata, K., Kurosawa, K., Tabata, R., Kitagawa, M., Takashima, T., Okuda, T. (2019) Seasonal variation in atmospheric particle electrostatic charging states determined using a parallel electrode plate device, Atmospheric Environment, 203, 62-69, doi:10.1016/j.atmosenv.2019.01.040.
  61. 67. Yonemichi, T., Fukagata, K., Fujioka, K., Okuda, T. (2019) Numerical simulation of parallel-plate particle separator for estimation of charge distribution of PM2.5. Aerosol Science and Technology, doi:10.1080/02786826.2019.1569198.
  62. 66. Ogino, K., Nagaoka, K., Ito, T., Takemoto, K., Okuda, T., Nakayama, S., Ogino, N., Seki, Y., Hamada, H., Takashiba, S., Fujikura, Y. (2019) Involvement of PM2.5-bound protein and metals in PM2.5-induced allergic airway inflammation in mice, Inhalation Toxicology, 30 (13-14), 498-508, doi:10.1080/08958378.2018.1561769.
  63. 65. Okuda, T., Sakaide, M., Fujioka, K., Tabata, R., Kurosawa, K., Nomura, Y., Iwata, A., Fujiwara M. (2019) Investigation of the Characteristics of Particulate Matter Suspended in a Subway Station Platform, Journal of Japan Society for Atmospheric Environment, 54 (1), 28-33.
  64. 64. He, Y., Gu, Z., Lu, W., Zhang, L., Okuda, T., Fujioka, K., Luo, H., Yu, C. (2019) Atmospheric humidity and particle charging state on agglomeration of aerosol particles, Atmospheric Environment, 197, 141-149, doi:10.1016/j.atmosenv.2018.10.035.
  65. 63. Onishi, T., Honda, A., Tanaka, M., Chowdhury, P.H., Okano, H., Okuda, T., Shishido, D., Terui, Y., Hasegawa, S., Kameda, T., Tohno, S., Hayashi, M., Nishita-Hara, C., Hara, K., Inoue, K., Yasuda, M., Hirano, S., Takano, H. (2018) Ambient fine and coarse particles in Japan affect nasal and bronchial epithelial cells differently and elicit varying immune response, Environmental Pollution Part B, 242, 1693-1701, doi:10.1016/j.envpol.2018.07.103.
  66. 62. Okuda, T., Shishido, D., Terui, Y., Fujioka, K., Isobe, R., Iwaki, Y., Funato, K., Inoue, K. (2018) Development of a high-volume simultaneous sampler for fine and coarse particles using virtual impactor and cyclone techniques, Asian Journal of Atmospheric Environment, 12 (1), 78-86, doi:10.5572/ajae.2018.12.1.078.
  67. 61. Arika Matsunaga, A., Okuda, T., Tsushima, K. (2017) A Factor Analysis of the High PM2.5 Concentration in Fujisawa City, Kanagawa Prefecture, Papers on Environmental Information Science, 31, 53-58 (in Japanese), doi:10.11492/ceispapers.ceis31.0_53.
  68. 60. Saha, M., Maharana, D., Kurumisawa, R., Takada, H., Yeo, G.B., Rodrigues, A.C., Bhattacharya, B., Kumata, H., Okuda, T., He, K., Ma, Y., Nakajima, F., Zakaria, M.P., Giang, D.H., Viet, P.H. (2017) Seasonal trends of atmospheric PAHs in five Asian megacities and source detection using suitable biomarkers, Aerosol and Air Quality Research, 17 (9), 2247-2262, doi:10.4209/aaqr.2017.05.0163.
  69. 59. Kiriya, M., Okuda, T., Yamazaki, H., Hatoya, K., Kaneyasu, N., Uno, I., Nishita, C., Hara, K., Hayashi, M., Funato, K., Inoue, K., Yamamoto, S., Yoshino, A., Takami, A. (2017) Monthly and diurnal variation of the concentrations of aerosol surface area in Fukuoka, Japan, measured by diffusion charging method, Atmosphere, 8 (7), 114, doi:10.3390/atmos8070114.
  70. 58. Okuda, T., Isobe, R. (2017) Improvement of a high-volume aerosol particle sampler for collecting submicron particles through the combined use of a cyclone with a smoothened inner wall and a circular cone attachment, Asian Journal of Atmospheric Environment, 11 (2), 131-137, doi:10.5572/ajae.2017.11.2.131.
  71. 57. Kaneyasu, N., Ohashi, H., Suzuki, F., Okuda, T., Ikemori, F., Akata, N., Kogure, T. (2017) Weak size dependence of resuspended radiocesium adsorbed on soil particles collected after the Fukushima nuclear accident, Journal of Environmental Radioactivity, 172, 122-129, doi:10.1016/j.jenvrad.2017.03.001.
  72. 56. Ogino, K., Nagaoka, K., Okuda, T., Oka, A., Kubo, M., Eguchi, E., Fujikura, Y. (2017) PM2.5 induced airway inflammation and hyperresponsiveness in NC/Nga mice, Environmental Toxicology, 32 (3), 1047-1054, doi:10.1002/tox.22303.
  73. 55. Kamiya, Y., Iijima, A., Ikemori, F., Okuda, T., Ohura, T. (2016) Source apportionment of chlorinated polycyclic aromatic hydrocarbons associated with ambient particles in a Japanese megacity, Scientific Reports, 6, Article number: 38358, doi:10.1038/srep38358.
  74. 54. Okuda, T., Yamazaki, H., Hatoya, K., Kaneyasu, N., Yoshino, A., Takami, A., Funato, K., Inoue, K., Nishita, C., Hara, K., Hayashi, M. (2016) Factors controlling the variation of aerosol surface area concentrations measured by a diffusion charger in Fukuoka, Japan, Atmosphere, 7 (3), 33, doi:10.3390/atmos7030033.
  75. 53. Hatoya, K., Okuda, T., Funato, K., Inoue, K. (2016) On-line measurement of the surface area concentration of aerosols in Yokohama, Japan, using the diffusion charging method, Asian Journal of Atmospheric Environment, 10(1), 1-12, doi:10.5572/ajae.2016.10.1.001.
  76. 52. Fujii, Y., Mahmud, M., Tohno, S., Okuda, T., Mizohata, A. (2015) A case study of PM2.5 characterization in Bangi, Selangor, Malaysia during the southwest monsoon season, Aerosol and Air Quality Research, 16 (11), 2685-2691, doi:10.4209/aaqr.2015.04.0277.
  77. 51. Zhang, H., Magara-Gomez, K.T., Olson, M.R., Okuda, T., Walz, K.A., Schauer, J.J., Kleeman, M.J. (2015) Atmospheric impacts of black carbon emission reductions through the strategic use of biodiesel in California, Science of the Total Environment, 538, 412-422, doi:10.1016/j.scitotenv.2015.08.030.
  78. 50. Okuda, T., Gungi, Y., Lenggoro, I.W. (2015) Measurement of the Electrostatic Charging State of Individual Particles in Ambient Aerosol Using Kelvin Probe Force Microscopy, Earozoru Kenkyu, 30(3), 190-197 (in Japanese), doi:10.11203/jar.30.190.[Aerosol Instrumentation Award 2016]
  79. 49. Tomoaki Okuda, T., Nagai, Y., Isobe, R., Funato, K., Inoue, K. (2015) Development of a Simple Single-Nozzle Middle-Volume PM2.5 Virtual Impactor and Its Performance Evaluation, Journal of Japan Society for Atmospheric Environment, 50 (4), 185-191 (in Japanese), doi:10.11298/taiki.50.185.
  80. 48. Okuda, T., Yoshida, T., Gunji, Y., Okahisa, S., Kusdianto, K., Gen, M., Sato, S., Lenggoro, I.W. (2015) Preliminary study on the measurement of the electrostatic charging state of PM2.5 collected on filter media, Asian Journal of Atmospheric Environment, 9 (2), 137-145, doi:10.5572/ajae.2015.9.2.137.
  81. 47. Okuda, T., Isobe, R., Nagai, Y., Okahisa, S., Funato, K., Inoue, K. (2015) Development of a high-volume PM2.5 particle sampler using impactor and cyclone techniques, Aerosol and Air Quality Research, 15 (3), 759-767, doi:10.4209/aaqr.2014.09.0194.
  82. 46. Okuda, T. (2014) Long-Term Trend and Current Status of PM2.5 in Beijing, 29 (4), 263-271 (in Japanese), doi:10.11203/jar.29.263.
  83. 45. Okuda, T., Schauer, J.J., Shafer, M.M. (2014) Improved methods for elemental analysis of atmospheric aerosols for evaluating human health impacts of aerosols in East Asia, Atmospheric Environment, 97, 552-555, doi:10.1016/j.atmosenv.2014.01.043.
  84. 44. Kaneyasu, N., Yamamoto, S., Sato, K., Takami, A., Hayashi, M., Hara, K., Kawamoto, K., Okuda, T., Hatakeyama, S. (2014) Impact of long-range transport of aerosols on the PM2.5 composition at a major metropolitan area in the northern Kyushu area of Japan, Atmospheric Environment, 97, 416-425, doi:10.1016/j.atmosenv.2014.01.029.
  85. 43. Okuda, T., Hatoya, K., Nakai, S., Tamura, K. (2014) Non-Destructive Simultaneous Multi-Elemental Analysis of PM2.5 Using Energy Dispersive X-ray Fluorescence Spectrometry with a Fundamental Parameter Quantification Technique and Its Application to an Epidemiological Study, Earozoru Kenkyu, 29 (S1), 218-224 (in Japanese), doi:10.11203/jar.29.s218.
  86. 42. Okuda, T., Kojima, R., Watanobe, K., Matsuura, S., Okubo, K., Hatoya, K., Gunji Y. (2013) Development of the analytical method for chromium in air adapted to the revision of substances requiring priority action, Journal of Japan Society for Atmospheric Environment, 48 (6), 268-273 (in Japanese), doi:10.11298/taiki.48.268.
  87. 41. Okuda, T., Gunji, Y., He, K., Ma, Y. (2013) Persulfate wet oxidation method for the determination of total phosphorus in atmospheric aerosols and its application for a year-round observation in Beijing, Asian Journal of Atmospheric Environment, 7 (3), 169-175, doi:10.5572/ajae.2013.7.3.169.
  88. 40. Okuda, T., Hatoya, K. (2013) Development of Non-Destructive Simultaneous Analytical Method for Multi-Elements in PM2.5 Using Energy Dispersive X-Ray Fluorescence Spectrometry with a Fundamental Parameter Quantification Technique, 28 (3), 214-221 (in Japanese), doi:10.11203/jar.28.214. [Research Paper Award 2014, Japan Association of Aerosol Science and Technology]
  89. 39. Okuda, T., Fujimori, E., Hatoya, K., Takada, H., Kumata, H., Nakajima, F., Hatakeyama, S., Uchida, M., Tanaka, S., He, K., Ma, Y., Haraguchi, H. (2013) Rapid and simple determination of multi-elements in aerosol samples collected on quartz fiber filters by using EDXRF coupled with fundamental parameter quantification technique, Aerosol and Air Quality Research, 13 (6), 1864-1876, doi:10.4209/aaqr.2012.11.0308.
  90. 38. Okuda, T., (2013) Measurement of the specific surface area and particle size distribution of atmospheric aerosol reference materials, Atmospheric Environment, 75, 1-5, doi:10.1016/j.atmosenv.2013.04.033.
  91. 37. Okuda, T., Takada, H., Kumata, H., Nakajima, F., Hatakeyama, S., Uchida, M., Tanaka, S., He, K., Ma, Y. (2013) Inorganic chemical characterization of aerosols in four Asian mega-cities, Aerosol and Air Quality Research, 13 (2), 436-449, doi:10.4209/aaqr.2012.09.0250.
  92. 36. Okuda. T., Matsuura, S., Okubo, K., Hatoya, K. (2013) Development of a Solar Powered PM2.5 Sampler, Earozoru Kenkyu, 28(1), 63-70 (in Japanese), doi:10.11203/jar.28.63.
  93. 35. Okuda. T (2012) Effects of Metallic Fuel Additives on the Chemical Composition of Diesel Engine Exhaust Particles, 27 (2), 156-159 (in Japanese), doi:10.11203/jar.27.156.
  94. 34. Kaneyasu, N., Ohashi, H., Suzuki, F., Okuda, T., Ikemori, F. (2012) Sulfate aerosol as a potential transport medium of radiocesium from the Fukushima nuclear accident, Environmental Science & Technology, 46 (11), 5720-5726, doi:10.1021/es204667h. [AIST Best Paoer Award 2016]
  95. 33. Magara-Gomez, K.T., Olson, M.R., Okuda, T., Walz, K.A., Schauer, J.J., (2012) Sensitivity of diesel particulate material emissions and composition to blends of petroleum diesel and biodiesel fuel, Aerosol Science and Technology, 46 (10), 1109-1118, doi:10.1080/02786826.2012.696315.
  96. 32. Magara-Gomez, K.T., Olson, M.R., Okuda, T., Walz, K.A., Schauer, J.J., (2012) Sensitivity of hazardous air pollutant emissions to the combustion of blends of petroleum diesel and biodiesel fuel, Atmospheric Environment, 50, 307-313, doi:10.1016/j.atmosenv.2011.12.007.
  97. 31. Yang, F., Tan, J., Shi, Z. B., Cai, Y., He, K., Ma, Y., Duan, F., Okuda, T., Tanaka, S., Chen, G., (2012) Five-year record of atmospheric precipitation chemistry in urban Beijing, China, Atmospheric Chemistry and Physics, 12 (4), 2025-2035, doi:10.5194/acp-12-2025-2012.
  98. 30. Okuda, T., Matsuura, S., Yamaguchi, D., Umemura, T., Hanada, E., Orihara, H., Tanaka, S., He, K., Ma, Y., Cheng, Y., Liang, L. (2011) The impact of the pollution control measures for the 2008 Beijing Olympic Games on the chemical composition of aerosols, Atmospheric Environment, 45 (16), 2789-2794, doi:10.1016/j.atmosenv.2011.01.053.
  99. 29. Okuda, T., Okamoto, K., Tanaka, S., Shen, Z.X., Han, Y.M., Huo, Z.Q. (2010) Measurement and source identification of polycyclic aromatic hydrocarbons (PAHs) in the aerosol in Xi’an, China, by using automated column chromatography and applying positive matrix factorization (PMF), Science of the Total Environment, 408 (8), 1909-1914, doi:10.1016/j.scitotenv.2010.01.040.
  100. 28. Okuda, T., Schauer, J.J., Olson, M.R., Shafer, M.M., Rutter, A.P., Walz, K.A., Morschauser, P.A. (2009) Effects of a platinum-cerium bimetallic fuel additive on the chemical composition of diesel engine exhaust particles, Energy & Fuels, 23, 4974-4980, doi:10.1021/ef900370v.
  101. 27. Shen Z.X., Cao, J.J., Arimoto, R., Han, Z.W., Zhang, R.J., Han, Y.M., Liu, S.X., Okuda, T., Nakao, S., Tanaka, S. (2009) Ionic composition of TSP and PM2.5 during dust storms and air pollution episodes at Xi’an, China, Atmospheric Environment, 43 (18), 2911-2918, doi:10.1016/j.atmosenv.2009.03.005.
  102. 26. Okuda, T., Kuroda, T., Nara, T., Okamoto, K., Okabayashi, Y., Naoi, D., Tanaka, S., He, Kebin, Ma, Yongliang, Jia, Yingtao，Zhao, Qing (2009) Development of Automated Column Chromatography System and Its Application to the Determination of Polycyclic Aromatic Hydrocarbons in Suspended Particulate Matter, BUNSEKI KAGAKU 58 (4), 287-292 (in Japanese), doi:10.2116/bunsekikagaku.58.287.
  103. 25. Kim, Ki-Hyun, Ma, Chang-Jin, Okuda, T. (2009) An analysis of long-term changes in airborne toxic metals in South Korea’s two largest cities from 1991 to 2004, Environmental Science and Pollution Research 16, 565-572, doi:10.1007/s11356-009-0104-x.
  104. 24. Tanimoto, H., Sato,K., Butler, T., Lawrence, M.G., Fisher, J.A., Kopacz, M., Yantosca, R.M., Kanaya, Y., Kato, S., Okuda, T., Tanaka, S., Zeng, J. (2009) Exploring CO pollution episodes observed at Rishiri Island by chemical weather simulations and AIRS satellite measurements: Long-range transport of burning plumes and implications for emissions inventories. Tellus 61B (2), 394-407, doi:10.1111/j.1600-0889.2008.00407.x.
  105. 23. Shen Z.X., Arimoto, R., Cao, J.J., Zhang, R.J., Li, X.X., Du, N., Okuda, T., Nakao, S., Tanaka, S. (2008) Seasonal variations and evidence for the effectiveness of pollution controls on water-soluble inorganic species in total suspended particulates and fine particulate matter from Xi’an, China. Journal of Air and Waste Management Association 58 (12), 1560-1570, doi:10.3155/1047-3289.58.12.1560.
  106. 22. Santosa, S. J., Okuda, T., Tanaka, S. (2008) Air pollution and urban air quality management in Indonesia, Clean - Soil, Air, Water 36 (5-6), 466-475, doi:10.1002/clen.200800038.
  107. 21. Okuda, T., Katsuno, M., Naoi, D., Nakao, S., Tanaka, S., He, K., Ma, Y., Lei, Y., Jia, Y. (2008) Trends in hazardous trace metal concentrations in aerosols collected in Beijing, China from 2001 to 2006, Chemosphere 72 (6), 917-924, doi:10.1016/j.chemosphere.2008.03.033.
  108. 20. Okuda, T., Nakao, S., Tanaka, S., Z.X. Shen, K. He, Y. Ma, Y. Lei, Y. Jia (2007) Characterization of water-soluble ionic composition of aerosols in Xi'an and Beijing, China, Chikyukagaku, 41 (4), 113-123. in Japanese,CiNii
  109. 19. Okuda, T., Nakao, S., Katsuno, M., Tanaka, S. (2007) Source identification of nickel in TSP and PM2.5 in Tokyo, Japan, Atmos. Environ., 41 (35), 7642-7648, doi:10.1016/j.atmosenv.2007.08.050.
  110. 18. Okuda, T., Katsuno, M., Tanaka, S., Kondo, Y., Takegawa, N., Komazaki Y. (2007) Measurement and Source Identification of Trace Metals in PM2.5 and PM1 Collected by Multi-Nozzle Cascade Impactor in Tokyo Metropolitan Area, Japan, Earozoru Kenkyu, 22 (2), 126-134 (in Japanese), doi:10.11203/jar.22.126.
  111. 17. Okuda, T.(2006) Recent advances of environmental organic geochemical studies on compound-specific stable carbon isotope analysis for polycyclic aromatic hydrocarbons (PAHs)Recent advances of environmental organic geochemical studies on compound-specific stable carbon isotope analysis for polycyclic aromatic hydrocarbons (PAHs), Res. Org. Geochem., 21, 1-12. in Japanese,CiNii
  112. 16. Okuda, T., Naoi, D., Tenmoku, M., Tanaka, S., He, K., Ma, Y., Lei, Y., Jia, Y., Zhang, D.-H. (2006) Polycyclic aromatic hydrocarbons (PAHs) in the aerosol in Beijing, China, measured by aminopropylsilane chemically-bonded stationary-phase column chromatography and HPLC/fluorescence detection, Chemosphere, 65 (3), 427-435, doi:10.1016/j.chemosphere.2006.01.064.
  113. 15. Okuda, T., Tenmoku, M., Kato, J., Mori, J., Sato, T., Yokochi, R., Tanaka, S. (2006) Long-term observation of trace metal concentration in aerosols at a remote island, Rishiri, Japan by using inductively coupled plasma mass spectrometry equipped with laser ablation. Water Air Soil Pollut., 174(1-4), 3-17, doi:10.1007/s11270-005-9000-2.
  114. 14. Shen, Z.X., Cao, J.J., Li, X., Okuda, T., Wang Y., Zhang, X.Y. (2006) Mass concentration and mineralogical characteristics of aerosol particles collected at dunhuang during ACE-Asia. Adv. Atmos. Sci., 23 (2), 291-298, doi:10.1007/s00376-006-0291-z.
  115. 13. Okuda, T., Iwase, T., Ueda, H., Suda, Y., Tanaka, S., Dokiya, Y., Fushimi, K., Hosoe, M. (2005) The impact of volcanic gases from Miyake Island on the chemical constituents in precipitation in the Tokyo Metropolitan area. Sci. Total Environ., 341 (1-3), 185-197, doi:10.1016/j.scitotenv.2004.09.036.
  116. 12. Okuda, T., Iwase, T., Ueda, H., Suda, Y., Tanaka, S., Dokiya, Y., Fushimi, K., Hosoe, M. (2005) Long-term trend of chemical constituents in precipitation in Tokyo metropolitan area, Japan, from 1990 to 2002. Sci. Total Environ., 339 (1-3), 127-141, doi:10.1016/j.scitotenv.2004.07.024.
  117. 11. Duan, F., He, K., Ma, Y., Jia, Y., Yang, F., Lei, Y., Tanaka, S., Okuda, T. (2005) Characteristics of carbonaceous aerosols in Beijing, China. Chemosphere 60 (3), 355-364, doi:10.1016/j.chemosphere.2004.12.035.
  118. 10. Okuda, T., Kato, J., Mori, J., Tenmoku, M., Suda, Y., Tanaka, S., He, K., Ma, Y., Yang, F., Yu, X., Duan, F., Lei, Y. (2004) Daily concentrations of trace metals in aerosols in Beijing, China, determined by using inductively coupled plasma mass spectrometry equipped with laser ablation analysis, and source identification of aerosols. Sci. Total Environ., 330 (1-3), 145-158, doi:10.1016/j.scitotenv.2004.04.010.
  119. 9. Okuda, T., Kumata, H., Naraoka, H., Takada, H. (2004) Molecular composition and compound-specific stable carbon isotope ratio of polycyclic aromatic hydrocarbons (PAHs) in the atmosphere in suburban areas. Geochem. J., 38 (1), 89-100, doi:10.2343/geochemj.38.89.
  120. 8. Kanke, H., Uchida, M., Okuda, T., Yoneda, M., Takada, H., Shibata, Y., Morita, M. (2004) Compound-specific radiocarbon analysis of polycyclic aromatic hydrocarbons (PAHs) in sediments from an urban reservoir. Nucl. Instrum. Methods Phys. Res., B., 223-224, 545-554, doi:10.1016/j.nimb.2004.04.102.
  121. 7. Okuda, T., Takada, H., Naraoka, H. (2003) Thermodynamic behavior of stable carbon isotopic compositions of individual polycyclic aromatic hydrocarbons derived from automobiles. Polycycl. Arom. Comp. 23 (2), 219-236, doi:10.1080/10406630308060.
  122. 6. Okuda, T., Kumata, H., Naraoka, H., Takada, H. (2002) Origin of atmospheric polycyclic aromatic hydrocarbons (PAH) in Chinese cites solved by compound-specific stable carbon isotopic analyses. Org. Geochem. 33 (12), 1737-1745, doi:10.1016/S0146-6380(02)00180-8.
  123. 5. Okuda, T., Kumata, H., Ishiwatari, R., Naraoka, H., Takada, H. (2002) Vertical distributions and delta-13C isotopic compositions of PAHs in Chidorigafuchi Moat sediment, Japan. Org. Geochem., 33 (7), 843-848, doi:10.1016/S0146-6380(02)00031-1.
  124. 4. Okuda, T., Kumata, H., Zakaria, M.P., Naraoka, H., Ishiwatari, R., Takada, H. (2002) Source identification of Malaysian atmospheric polycyclic aromatic hydrocarbons nearby forest fires using molecular and isotopic compositions. Atmos. Environ., 36 (4), 611-618, doi:10.1016/S1352-2310(01)00506-4.
  125. 3. Okuda, T. (2002) Recent environmental chemical studies and future perspectives for compound-specific stable carbon isotope analysis of polycyclic aromatic hydrocarbons (PAHs), Chikyukagaku, 36 (1), 1-14. in Japanese,CiNii
  126. 2. Zakaria, M.P., Okuda, T., Takada, H. (2001) Polycyclic aromatic hydrocarbon (PAHs) and hopanes in stranded tar-balls on the coasts of Peninsular Malaysia: applications of biomarkers for identifying sources of oil pollution. Mar. Pollut. Bull., 42 (12), 1357-1366, doi:10.1016/S0025-326X(01)00165-5.
  127. 1. Okuda, T., Naraoka, H., Ishiwatari, R. (2000) Separation of PAHs in environmental samples by use of solid-phase extraction system for carbon isotope analysis. J. Mass Spectrom. Soc. Jpn., 48 (6), 387-394, doi:10.5702/massspec.48.387.

Research

Vision

Highlights

Research Topics

Research Grants


Environmental Chemistry Lab, Department of Applied Chemistry,
Faculty of Science and Technology, Keio University
Led by Tomoaki OKUDA, Ph.D.

Copyright © 2013-2020 Tomoaki OKUDA, All Rights Reserved.

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