This evaluation is based on over 10 years of publicly available environmental data, sourced from credible official channels, along with environmental information voluntarily disclosed by the companies. By analyzing basic details about the listed companies, their parent companies, affiliates, and both direct and indirect holdings, a network of relationships among these companies is established. The evaluation uses both qualitative and quantitative indicators, incorporating advanced technologies such as artificial intelligence and model analysis to assess the environmental performance of the listed companies. A total of 1,837 listed companies were included in the evaluation, all of which are key pollutant discharge units, either directly or through affiliated companies. Among these, 593 listed companies are themselves key pollutant discharge units, and the evaluation covers a total of 6,514 affiliated enterprises.