<報文>光化学大気汚染における一過性高濃度オキシダントと被害 : 東京都世田谷区における一事例

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概要

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• At about noon on July 9, 1974, a number of pupils (109) at the Seta Junior High School, Setagaya, Tokyo, Were affected by photochemical smog. A sharp peak of oxidant concentration amounting to 0.29 ppm with a half-width duration of 15 min was recorded at 11:50 at the Tamagawa monito-ring station situated 1.7km on the windward of the school. Records of oxidant concentration-time curves at four monitoring stations on the leeward have been compared with each other including that of Tamagawa. Although the peak concentration decayed gradually with the distance from Tamagawa, principal feature was retained through ca. 10km and for ca. 50 min. The delay of time of maximum oxidant concentration at each measuring point approximately agrees with the time required for the wind to reach each measuring point which is calculated from the distance and the mean wind speed. Oxidant concentration-time curves recorded at four monitoring stations in Kawasaki, Kanagawa, the opposite side of Tama River, were also examined. In addition, the maximum (one-hour) oxidant concentrations and the directions of wind at that time measured at over thirty monitoring stations have been plotted on a map, and the transport of the air mass with high oxidant concentration has been illustrated. The rough dimension of the air mass has been estimated. The sharp peak found at Tamagawa has been ascribed to the sudden descent of air mass including oxidant of high concentration from high above the neighboring area on the windward of Tamagawa.

• 横浜国立大学の論文

著者

• 村瀬 暁

  川崎市公害監視センター

• 志田 正二

  横浜国立大学環境科学研究センター環境基礎工学研究室

• 山岸 登久光

  東京都世田谷区役所公害対策課

• 海老沢 和男

  東京都大田区役所公害対策課

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