2024 Yes Modeling indoor particulate exposures in inner-city school classrooms https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5340641/ Gaffin, Jonathan M. North America Observational Particulate Matter (PM) Black carbon Asthma Black carbon Exposure modeling Particulate matter (PM) fine particulate matter (PM2.5) School sulfur tracer method PM2.5 and black carbon were measured in 136 classrooms across 30 schools. Indoor PM2.5 had variable infiltration and classroom sources. Models using outdoor data and sulfur ratios predicted indoor exposure, aiding asthma research and risk assessment. 2017