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<p>Atmospheric hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) was intensively measured in the Tokyo metropolitan area (Kazo City, Saitama Prefecture and Shinjuku-ku, Tokyo), Japan in the summer of 2022 and 2023. In particular, the temperatures in the summer of 2023 were very high. H<sub>2</sub>O<sub>2</sub> and ozone (O<sub>3</sub>) concentrations were generally higher in Kazo City than in Shinjuku-ku, and the concentrations were particularly higher during the period of typical summer atmospheric pressure pattern when Photochemical Oxidant Warning was issued in Saitama Prefecture. Sufficiently high concentrations of H<sub>2</sub>O<sub>2</sub> exceeding 3-4 ppb (30-minute values) were occasionally measured, which have hardly been seen in Toyama Prefecture, where the air environment is relatively clean in Japan. The oxidation capacity of SO<sub>2</sub> seems to be high in summer in the Tokyo metropolitan area. In Kazo City, H<sub>2</sub>O<sub>2</sub> was highly positively correlated with O<sub>3</sub>. When the atmospheric pressure pattern was typical for summer, both O<sub>3</sub> and H<sub>2</sub>O<sub>2</sub> reached their maximums at around 15 JST in Kazo City; however, in Shinjuku-ku, the peak time of O<sub>3</sub> was in the early afternoon (around 13 JST), while the highest concentration of H<sub>2</sub>O<sub>2</sub> was seen at around 15 JST when NO<sub>X</sub> became significantly low.</p>

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Hydrogen Peroxide Measured in the Tokyo Metropolitan Area, Japan: Case Studies during Summer Campaigns in 2022 and 2023

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  • 发表日期：

    2025年1月1日

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  • Koichi Watanabe,
  • Taisei Akahori,
  • Shuhei Kaji,
  • Nanami Mitsutsuji,
  • Michiyo Chatani,
  • Shinichi Yonemochi,
  • Ritsu Takahashi,
  • Hiroki Shinozaki,
  • Kazumasa Shinohara,
  • Hiroshi Okochi,
  • Hiroshi Hayami

摘要

Atmospheric hydrogen peroxide (H2O2) was intensively measured in the Tokyo metropolitan area (Kazo City, Saitama Prefecture and Shinjuku-ku, Tokyo), Japan in the summer of 2022 and 2023. In particular, the temperatures in the summer of 2023 were very high. H2O2 and ozone (O3) concentrations were generally higher in Kazo City than in Shinjuku-ku, and the concentrations were particularly higher during the period of typical summer atmospheric pressure pattern when Photochemical Oxidant Warning was issued in Saitama Prefecture. Sufficiently high concentrations of H2O2 exceeding 3-4 ppb (30-minute values) were occasionally measured, which have hardly been seen in Toyama Prefecture, where the air environment is relatively clean in Japan. The oxidation capacity of SO2 seems to be high in summer in the Tokyo metropolitan area. In Kazo City, H2O2 was highly positively correlated with O3. When the atmospheric pressure pattern was typical for summer, both O3 and H2O2 reached their maximums at around 15 JST in Kazo City; however, in Shinjuku-ku, the peak time of O3 was in the early afternoon (around 13 JST), while the highest concentration of H2O2 was seen at around 15 JST when NOX became significantly low.