2024 Yes Associations Between School Characteristics and Classroom Radon Concentrations in Utah's Public Schools: A Project Completed by University Environmental Health Students https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7460026/ Davis, Elizabeth North America Observational Exposure Elementary (K-5) Middle/Jr High (6-8) High School (9-12) Radon Environmental Exposure assessment Occupational Radon School Radon was measured in 2,289 Utah classrooms; 2% exceeded EPA action levels. Older HVAC systems and school size influenced radon levels. Running and updating HVAC systems can reduce radon exposure, aiding lung cancer prevention. 2020