2024 No https://doi.org/10.1016/j.envres.2024.119955 Wang, Peng Asia Observational Exposure Study Modeling Students Elementary (K-5) Particulate Matter (PM) Dust Heavy metals Other Health risks Heavy metals Kindergarten Dust Particle-size effect Source apportionment Analyzing Beijing kindergarten dust, the study measures heavy metal concentrations across particle sizes, applying health risk models and source apportionment to reveal that mid-sized dust (DT100) carries the highest contamination, largely from chromium, emphasizing size-driven contamination patterns.