Open Source if you do not mind some DIY. While this is part of a public outdoor air quality monitoring project, the device is perfectly usable for indoor measur

Open Source if you do not mind some DIY. While this is part of a public outdoor air quality monitoring project, the device is perfectly usable for indoor measurement as well. https://luftdaten.info/en/construction-manual/ https://luftdaten.info/en/construction-manual/