Regulation & law · 28/08/2025

EPA Solicits Public Comment on NASA's Request for Emergency Exemption to Use Pesticide Ortho-Phthalaldehyde for ISS Cooling System

The US Environmental Protection Agency (EPA) is soliciting public comment on a request from NASA to use the pesticide ortho-phthalaldehyde (OPA) to treat the coolant fluid of the International Space Station (ISS) to control bacteria, as a new chemical not registered by EPA.