Since 2021, The Paper and IPE have jointly released dynamic rankings of the environmental performance of Chinese listed companies. The aim is to assess environmental risks and opportunities based on environmental big data, discover green investment opportunities, promote corporate environmental responsibility, improve environmental governance, and use market incentives to facilitate green transformation and low-carbon development. This evaluation covers a total of 277 listed companies and affiliated enterprises in the non-ferrous metal smelting and rolling processing industry, of which 227 are key pollutant discharge units for the year 2020.