2.Pollution source
Energy use. With the rapid growth of our economy and the improvement of people's living standard, the energy demand is rising. The emission of sulfur dioxide in China is increasing rapidly. This is the main cause of the longest and most harmful acid rain pollution in southwest China. Motor vehicle exhaust In recent years, the number of motor vehicles in major cities of China has increased by a large margin, and vehicle exhaust gas has become an important source of urban air pollution. In addition, automobile emissions of lead are also important pollutants in the urban atmosphere.
2.Water pollution
According to the State of the Environment Bulletin of China and the report of the Ministry of Water Resources, in 1997, the seven major water systems, lakes, reservoirs, and parts of China's groundwater were polluted to varying degrees, and the proportion of river pollution was higher than that of 1996. In the dry season, the length of polluted rivers increased by 6.3 percentage points, and the periods of high water supply increased by 5.5 percentage points. Of the more than 50,000 km of rivers assessed, 42 were polluted, of which 12.2
