2025 No https://doi.org/10.1093/rpd/ncaf009 Vukotic, Perko Europe Observational Exposure Study Students Staff Elementary (K-5) Middle/Jr High (6-8) High School (9-12) Radon Other Using passive detectors, researchers measured radon in 2,336 rooms across 392 Montenegrin public schools. Some ground-floor rooms exceeded 1,000 Bq/m³. Annual doses averaged 0.66 mSv, with some up to 11 mSv, highlighting potential health risks for pupils.