The aging process of plastics in the environment is gradually becoming a globally significant issue of concern. The long-term accumulation and degradation of plastics in the natural environment not only produce tiny fragments of plastic, known as micro/nanoplastics, but may also release a large amount of harmful chemical substances, such as plasticizers, flame retardants, and plastic monomers. These substances enter the soil and water bodies, ultimately affecting the health of the ecosystem. Additionally, the aging of plastics may lead to the formation of new, unknown toxic substances, posing potential impacts on the ecosystem and human health. Therefore, this session focuses on the new pollution problems caused by plastic environmental aging, delving into hot topics such as the mechanism of plastic environmental aging, the release process of harmful substances, and the ecological risks of plastic environmental aging.