Classrooms Fail Air Quality Tests: Many NSW Schools Unventilated

An extensive study of air quality in New South Wales public schools has uncovered concerning findings regarding carbon dioxide (CO2) levels in classrooms. The University of New South Wales report, which examined 59 schools across Sydney, Newcastle, and Wollongong, indicated that almost a third recorded CO2 levels not considered optimal for learning most of the time. Seventeen classrooms consistently surpassed the National Construction Code's recommended threshold of 850 parts per million, with three schools experiencing levels above 1000 parts per million for extended periods.

Researchers noted that classrooms with better cross-ventilation and those equipped with ducted air conditioning systems, as part of the Cooler Classrooms initiative, generally showed lower CO2 concentrations. While nitrogen dioxide levels were also measured, with five out of 27 schools exceeding the NSW hourly threshold, concern for this pollutant typically relates to short-term high exposures. The Department of Education stated that the detected levels did not pose a safety threat and is consulting with hygienists for follow-up assessments.

The study, conducted during 2024 and 2025, has prompted calls for mandatory air quality monitoring in all schools and a prioritization of mechanical ventilation installations. Advocates argue that poor indoor air quality not only affects students' concentration and learning capacity but also poses risks to those with pre-existing health conditions. The department has provided updated ventilation advice to schools, aiming to address these identified ventilation deficiencies.