On the origin and the trend of acid precipitation in China

The acidity of the precipitation in China as well as the area affected by acidic raimfalls have increased in the years, along with the rapid economic growth in china. Field observations indicate that acid precipitation often occur are the southern par, of china, although the emissiors of the precursors are stronger in the North.In this paper,we explain the geographical distribution of acid precipitation in china, based on the content alkaline ions in soil, soil acidity, atmospheric particulate concentration, aerosol buffering capacity and atmospheric dispersion. It is further anticipated that continuous increasing of sulfur emissions in the North will eventually result in acid rain in the northern part of China. On the basis of the projection of SO2 and No emissions,it is argued that the problem of acid precipitation may get worse towars the year 2020,if expenditure on emission control maintains at current level.