Refers to an action taken by human beings to protect nature. The green environmental protection sign here means that the sign consists of three parts, namely the green environmental protection below, the left and right leaves and the central bud, symbolizing the natural ecology. The color is green, which symbolizes life, agriculture and environmental protection. The figure is a right circle, indicating protection.
atmospheric pollution
pollution source
Energy use. With the rapid economic growth and the improvement of people's living standards in China, the demand for energy is rising.
China's sulfur dioxide emissions are increasing rapidly. This is the main reason why acid rain pollution lasts the longest and is the most harmful in southwest China.
Automobile exhaust. In recent years, the number of motor vehicles in major cities in China has greatly increased, and motor vehicle exhaust has become an important source of urban air pollution.
In addition, lead emitted by automobiles is also an important pollutant in the urban atmosphere.
water pollution
pollution source
Industrial wastewater. Industrial water pollution mainly comes from paper industry, metallurgical industry, chemical industry and mining industry.
Municipal domestic sewage. Although the discharge of industrial wastewater has decreased year by year in the past decade, the total amount of domestic sewage is increasing.
solid waste pollution
pollution source
Industrial solid waste. Municipal solid waste.
noise pollution
Pollution status quo
According to the Bulletin of Environmental Status of China, during the period of 1997, the noise in most cities in China was at a moderate level of pollution, among which the domestic noise had a great influence and showed an expanding trend. Traffic noise has the greatest impact on the environment.
The equivalent sound level of road traffic noise in China ranges from 67.3 to 77.8 dB, and the national average is 7 1 dB (length-weighted). Among the 49 urban roads monitored, the sound level exceeding 70 decibels accounts for 54.9% of the total monitoring length.
The equivalent sound level of urban environmental noise is 53.5-65.8 dB, and the national average is 56.5 dB (area-weighted). Among the 43 cities, the sound level in 33 cities exceeds 55 decibels, and the equivalent sound level in Datong, Kaifeng and Lanzhou exceeds 60 decibels, which is very serious.
The noise of each functional area generally exceeds the standard. The percentage of cities exceeding the standard is: special residential area 57.1%; Residents, cultural and educational areas 71.7%; Residential, commercial and industrial mixed zone 80.4%; Industrial concentration area 21.7%; The traffic trunk road is 50.0%.
Environmental protection means that human beings consciously protect natural resources, make rational use of natural resources, and prevent the natural environment from being polluted and destroyed; It is necessary to comprehensively control the polluted and destroyed environment and create an environment suitable for human life and work. Environmental protection refers to various actions taken by human beings to solve real or potential environmental problems, coordinate the relationship between human beings and the environment, and ensure the sustainable development of economy and society. Its methods and means include engineering technology, administration, law, economy, publicity and education, etc.