2002’ACID RAIN POLLUTION IN GUIZHOU PROVINCE-A CIRCUMSTANCE ANALYSIS

In order to get accurate and timely information about the status quo of acid rain pollution and its developing trend in Guizhou Province so as to provide the scientific basis for controlling acid rain in the whole province, annual monitoring activities were carried out on the pH and ion composition of precipitation in the whole province from March, 2002 to Feb.,2003. The results showed that the pH value of precipitation throughout the province is 5.38, and a value of 4.31 was reported from some individual cities. This indicates that the pollution caused by acid rain is very serious. Acid rain pollution exhibits an obvious seasonal variation trend, i.e., the frequency of occurrence of acid rain is higher in winter than in other seasons, with a large influence scale. On account of its geographical distribution, the highest frequency of acid rain appears in central Guizhou (including Zunyi, Duyun, Anshun and Kaili). Acid rain pollution in the downtown areas of cities is more serious than in the suburbs. Acid rain pollution in the whole province is designated to coal smoke pollution.