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To provide a representative estimate for the school-time radon levels, measurements should be made in the lowest-level occupied (occupied by an individual for more than 4 hours per day) classrooms or offices of the building, preferably at the same time. A radon measurement should be made in each room occupied in a basement, or if no basement exists, on the ground floor or the floor with the lowest-level occupied rooms. A room is the space enclosed by walls that reach the ceiling. A room subdivided by partitions can be treated as one room. For larger rooms, one detector should be placed for every 200 m2 of floor space.
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