Regulation & law · 11/09/2026

EPA Solicits Public Comment on NASA's Request for Emergency Exemption to Use Pesticide Ortho-Phthalalaldehyde

The 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 that has not been registered by EPA.