2022 No https://doi.org/10.1016/j.buildenv.2022.109220 Karam, Jennifer Asia Experimental Modeling Students Ventilation rates Carbon Dioxide (CO2) Particulate Matter (PM) Viruses Infections Other Intermittent air jet system Portable air cleaners Cross-contamination Air quality in classroom CFD modeling, validated with classroom experiments, evaluated intermittent air jet systems with portable air cleaners; found 67–87% reduction in cross-contamination exposure and minimal energy cost increase. Supports improved classroom ventilation design to limit airborne infection spread.