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[Ｃ−３.２.４　Studies on the Impacts of Controlling Techniques for the Emission of Acid-Precursors on the Formation Processes of Acidic and/or Oxidative Substances]

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[Total Budget for FY1997-1999]

　7,689,000 Yen
　(FY 1999: 2,337,000 Yen)

［Abstract］

　Although there are many factors affecting the forest trees, acid deposition and oxidative air pollutants are most important from a point of view of atmospheric chemistry. In this study following three researches were carried out. (1) Back trajectories of air mass which reached the top of Mt. Daisen every day in 1992 were calculated and classified. The contribution of air masses passing over northern or central China was found more than 60% in winter. (2) Gaseous hydrogen peroxide, which is suspected being one of causes for forest decline, was measured in National Institute for Environmental Studies. Impacts of meteorological factors and air pollutants on the variation of concentration were analyzed. (3) Ozone reactions with natural hydrocarbons were examined in a large-volume (6 m³) smog chamber in order to elucidate the reaction mechanisms to produce gaseous hydroperoxides.

［Key Words］

　Forest Damage, Peroxides, Ozone, Natural hydrocarbons, Acid deposition