Indoor Radon Exposure in Italian Schools.

BACKGROUND: The aim of the study was to assess radon concentration in schoolrooms in a city located in the midwest of Italy.

METHODS: A two-phase environmental study was carried out in 19 school buildings of 16 primary, secondary, and tertiary schools.

RESULTS: Median (interquartile range-IQR) indoor radon concentration in schoolrooms was 91.6 (45.0-140.3) Bq/m³. The highest (median 952.8 Bq/m³) radon concentration was found in one (3.6%) classroom, located in a building of a primary school whose median concentration was 185 Bq/m³. Radon concentration was significantly correlated with the number of students and teachers, foundation wall construction material, and with the absence of underground floors. A geopedological survey was performed close to the building with highest radon level, showing the presence of granite and tonalithic granodiorite in the soil.

CONCLUSIONS: Radon levels should be routinely assessed where individuals live or work. Schools are susceptible targets, because of childhood stay and the long daily stay of occupants. Low-cost interventions, such as implementation of natural air ventilation and school maintenance, can reduce radon levels, limiting individual exposure.