This App is part of the IndoorCO2map.com project , a citizen data collection initiative to collect data about the CO2 concentration in non-residential Buildings (shops, restaurants, hospital etc.). Using this app and a supported CO2 Sensor, you can help creating a large and comprehensive dataset about Indoor CO2-Levels. Currently Aranet , Airvalent, AirSpot and the Inkbird-IAMT1 Sensors are supported.