2020 No https://doi.org/10.1016/j.buildenv.2020.106986 Ren, Jianlin North America Experimental Exposure Study Students High School (9-12) Particulate Matter (PM) Particles Particulate matter (PM) Emissions Resuspension Flooring Two-year field study measured airborne particulate matter (PM) in 39 Texas high school classrooms with mechanical ventilation. PM levels varied by flooring and outdoor sources. Understanding PM exposure can inform design and filtration strategies for student health.