Term Name:	environmentally persistent free radical
Synonyms:	environmentally persistent free radicals, EPFR, EPFRs
Definition:	Any organic free radical stabilized on or inside other fine particles (PM2.5). It is a class of toxic air pollutants that have strong durability, can generate reactive oxygen species, and cause serious environmental pollution and toxicity.
Ontology:	ChEBI [CHEBI:229460]  ( EBI )