STOMP is an ARPA-H research program focused on measuring micro- and nanoplastics in the body, understanding how they move through organs and cells, and developing ways to remove them. Its work spans measurement and mechanisms in an initial phase, followed by efforts to translate measurement methods for clinical use and develop removal approaches. The program page describes research on particles in biological tissues and animal organs, with the longer-term aim of supporting detection and reduction of potentially harmful microplastics.