Type of environmental pollution

In the context of environmental issues, air pollution remains one of the most pressing challenges in China. According to the "China Environmental Bulletin," it was reported that in 1997, urban air quality across the country remained at a high level of pollution, with northern cities experiencing more severe conditions than their southern counterparts (refer to Figure 3-1). The annual average concentration of sulfur dioxide ranged from 3 to 248 micrograms per cubic meter, while the national average stood at 66 micrograms per cubic meter. More than half of the cities exceeded the national secondary standard for sulfur dioxide, which is set at 60 micrograms per cubic meter. In particular, northern cities had an annual average of 72 micrograms per cubic meter, while southern cities averaged around 60 micrograms per cubic meter. Cities located in the southwest, such as Yibin, Guiyang, and Chongqing—regions known for their high-sulfur coal usage—and cities with heavy energy consumption, including those in Shanxi, Shandong, Hebei, Liaoning, Inner Mongolia, Henan, and parts of Shaanxi, faced particularly severe sulfur dioxide pollution. The primary sources of this pollution include energy use. As China's economy grew rapidly and living standards improved, energy demand surged. This increase in energy consumption led to a sharp rise in sulfur dioxide emissions, which became a key factor behind the longest and most damaging acid rain events in the Southwest region. Additionally, motor vehicle exhaust has become a major contributor to urban air pollution. Over recent years, the number of vehicles in major Chinese cities has risen significantly, making vehicle emissions a critical source of pollutants. Alongside carbon monoxide and nitrogen oxides, lead emissions from automobiles also play a significant role in degrading urban air quality. Environmental protection involves the conscious efforts of humans to safeguard natural resources and use them responsibly, preventing the degradation and pollution of the environment. It encompasses comprehensive management of polluted areas to create a healthier living and working environment for people. Environmental protection refers to all actions taken by society to address current or potential environmental problems, balance human activities with nature, and ensure sustainable economic and social development. These efforts include engineering solutions, administrative measures, legal frameworks, economic incentives, public awareness campaigns, and educational programs.

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