Fondsites Tools
Clean Air Society
Ventilation and CO2 Helper
Turn a stuffy-room observation into a ventilation or filtration next step.
CO2 can be a useful clue for ventilation around people, but it is not a full indoor air quality score.
This helper connects the trend to practical actions: open, exhaust, circulate, filter, pause, or investigate.
Interactive Tool
Ventilation and CO2 Helper
Change the inputs and the result updates in your browser. Results are not saved, shared, or added to the URL.
Result
Adjust the fields to calculate a result.
How to use this tool
- Enter the current CO2 reading or choose unknown if you only have a stale-room complaint.
- Add people count, room duration, and outdoor condition.
- Use the result to pick one reset that fits the room.
What the result means
A higher CO2 trend often suggests the room needs more outdoor air exchange when outdoor air is acceptable.
Filtration can reduce particles but does not remove CO2; ventilation and occupancy changes matter for CO2.
Assumptions and limitations
Consumer CO2 monitors vary. Trends are more useful than treating one number as a diagnosis.
Outdoor smoke, high pollen, heat, humidity, or security constraints can change the best ventilation choice.