Students in classrooms fulfilling the required ventilation rate (6 l/s per person) had higher mathematics test results.
Ventilation rates were also associated with both perceived air quality and thermal comfort among students.
Some 52% of the classrooms with fully mechanical ventilation met the current standards, whereas all other classrooms failed.
Other factors related to ventilation adequacy were HVAC upgrade and number of students in classrooms.
The results did not indicate a need to increase ventilation rate above the current standards.