Research progress of acid precipitation in China.

The acid rain area in China is one of the three main acid areas in the world,along with Europe and North America.Scientific controlling countermeasures for acid rain are very necessary in China,and timely summarizing of the research progress on acid rain is an important knowledge base for acid rain pollution control.This article provides an overview of most of the recent acid rain investigations in China,including the distribution pattern characteristics,reasons and control strategies concerned with precipitation in China,and the results for precipitation.The major conclusions are as follows: acid rain pollution in China is still sulfur type with a trend to sulfuric-nitrous mixed type;the acid rain area in Southern China has had no obvious change,while that in Northern China is growing;the heavy acid rain area is the largest since 1994,but the acidity is weakened to some degree;overall,in comparison with previous years,the acid rain situation in 2008 has deteriorated.In addition,the causes and control strategies are discussed.