I have the Airthings Wave+ and one thing that bugs me is the relative humidity threshold. Anything above 60% will give a yellow led warning. If you have many indoor plants, live in a forest, or even just ventilate a lot on rainy days the sensor will show an air quality warning. I would like to take humidity out of the equation as I much rather focus on CO2, VOC and Radon. Otherwise a great sensor that was easy to integrate in my own scripts as you can easily get all sensor readings over bluetooth.