WorkSafeNB guidance indicates CO2 levels below 5,000 ppm over an eight-hour period weighted average, or 30,000 ppm over a 15-minute weighted average do not pose risks to occupants’ health and safety. A separate guidance CO2 level of 1,500 ppm was developed for unventilated schools. Results above this level indicate that actions should be taken to improve air circulation.
In the 2020-21 school year, testing was completed in all schools identified as needing an integrated mechanical ventilation system. In the 2021-22 and 2022-23 school years, testing was conducted in schools without an integrated mechanical ventilation system that registered peak levels above 1,500 ppm in testing the previous year. In the 2023-24 school year, testing was scheduled to be completed in all schools identified as part of the school ventilation program, including those whose integrated mechanical ventilation systems were installed and operational.
A summary of air quality test results is available below.