From New Zealand - Ventilation for school buildings
Carbon dioxide (CO2) monitoring
Monitoring CO2 levels is one way to quickly assess whether a space is well ventilated when it is occupied. Elevated CO2 levels for a sustained period of time (for example, over an hour or more) indicate that fresh air isn’t flowing into a space quickly enough to meet the needs of the space’s occupants.
- A space under 800ppm is considered well ventilated.
- When levels start to climb above this level, associated risk of airborne transmission of illnesses also begins to rise.
- We advise schools to take action to improve ventilation if CO2 levels stay above 800ppm for an hour or more.
For more information click on this link: https://www.education.govt.nz/school/property-and-transport/projects-and-design/design/general-design-guidance/ventilation-for-school-buildings/#assess
