I’ve purchased two AirGradient ONE indoor quality monitors to measure air quality in my home. AirGradient devices are open-source, so you can flash your own custom firmware and collect your air data locally rather than sending it to AirGradient’s proprietary cloud dashboard. I keep an AirGradient ONE air quality monitor in my office to measure CO2 and pollution. The existing documentation for flashing firmware requires you to use the Arduino IDE, a clunky GUI program:
