Improved Air Quality in Tokyo has Affected Spring Water’s pH

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  • MATSUYAMA Hiroshi
    Department of Geography, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University

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  • 東京の大気浄化は湧水のpHにも影響を与えている
  • トウキョウ ノ タイキ ジョウカ ワ ワキミズ ノ pH ニ モ エイキョウ オ アタエテ イル

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Abstract

<p>　Air pollutants in Tokyo Metropolis has been decreasing since 1990s because of emission control regulations imposed by the Tokyo Metropolitan Government. Still, the concentration of NO2, a representative acidification substance, is high in the central part of Tokyo than in the suburbs. As a result of air purification, the pH of water in many springs in Tokyo has been increasing. Many springs for which pH shows a significant increasing trend are distributed in the suburbs, which is consistent with the distribution of atmospheric NO2 concentrations. The minimum value of pH in the springs appeared mainly in around 1995 and 2008 during October (rainy season), although it appeared in 2008-2009 during February (dry season). The minimum value around 1995 corresponded to long-term variation of NO2 concentration in the atmosphere, whereas that in 2008-2009 corresponded to the beginning of the decrease of cross-border air pollutants.</p>

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