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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 were seriously polluted
Industrial solid waste Urban domestic waste.
pollution status
Pollution source
02
noise pollution
pollution status
According to the China Environmental Status Bulletin, the noise of most cities in China was in the middle level of pollution in 1997. Among them, the impact of noise on living noise was large and expanded. Traffic noise has the strongest impact on the environment.