No IRIS Act of 2025

This bill prohibits the Environmental Protection Agency (EPA) from using assessments generated by its Integrated Risk Information System (IRIS) program in key regulatory actions. Specifically, it blocks the EPA from relying on IRIS assessments to develop or issue rules, conduct enforcement or permitting, or inform air toxics mapping tools. The bill directly affects how the EPA conducts its environmental regulation and risk assessment work. It represents a procedural change limiting the use of existing EPA scientific assessments in regulatory decision-making.