The main purpose of this legislation is to prevent the Environmental Protection Agency (EPA) from using certain assessments produced by its Integrated Risk Information System (IRIS) when making rules or taking regulatory actions. The goal is to limit the influence of these assessments on the EPA's decision-making processes regarding environmental regulations. Key provisions of the legislation include a clear prohibition on the EPA's use of IRIS assessments for developing or finalizing regulations, enforcing laws, or conducting any permitting actions.