N_URB2 nursery also had children until 5 years old, divided by
age into 7 different classrooms. Although the building had 2 floors,
all the nursery rooms were located in the ground floor. All the
classrooms had direct access to small outdoor playgrounds and the
access doors were usually opened. N_URB2 building had no air
conditioning system and the electric heaters were rarely used
during the periods of measurements.