The development of the mining and metallurgical industry not only emits a large amount of sulfur dioxide, but also releases many heavy metals, such as lead, zinc, cadmium, copper, and arsenic, which pollute the atmosphere, soil and waters. The rapid development of the chemical industry during this period constituted another important source of environmental pollution. In addition, dust from the cement industry and waste liquid from the paper industry. Will also cause pollution to the atmosphere and water bodies
Since the 1920s, with the development of the organic chemical industry using oil and natural gas as the main raw materials, Western countries have not only synthesized the three major polymer synthetic materials of rubber, plastic and fiber, but also produced a variety of organic chemical products.
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