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Deficit of particulate chlorine and the nonacid rain in Beijing

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The acidity of precipitation in both clean and polluted areas was calculated for atmospheric CO2 and SO2 in equilibrium with water. pH values of 5 and 4.5 were obtained. In Beijing the pH value is increased due to particulate chlorine reactivity and rainout of CaO in the atmosphere. The increase of pH value is related to liquid water content in cloud and the elemental concentrations of particulate Cl and Ca in the atmosphere. This mechanism may help to explain the nonacid rain observed in Beijing where the air pollution problem is serious, as viewed by SO2 concentration and particulate burden in the atmosphere.

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Correspondence to Mingxing Wang.

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Wang, M. Deficit of particulate chlorine and the nonacid rain in Beijing. Adv. Atmos. Sci. 1, 76–83 (1984). https://doi.org/10.1007/BF03187618

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  • Aerosol Particle
  • Acid Rain
  • Rainfall Amount
  • Rain Water
  • Polluted Area