Size-Dependent Characteristics, Exposure Risk, and Formation Mechanisms of Environmentally Persistent Free Radicals in Atmospheric Particulate Matter.
Environmentally persistent free radicals (EPFRs) in atmospheric particulate matter (PM) are of increasing concern because of their potential health risks. This study systematically investigated the occurrence and characteristics of EPFRs in PM2.5 (particulate matter with an aerodynamic diameter ≤ 2.5 μm), PM10 (particu...