they have very interesting articles on the topic, and I'm happy with the monitor I bought from them. Although I can't compare it to a reference, they were teste

they have very interesting articles on the topic, and I'm happy with the monitor I bought from them. Although I can't compare it to a reference, they were tested by the company/institute monitoring the air quality of paris and got a good score. I just which they could register their data on a sd card. They are open source, and provide the code source of their software as well as for the hardware, which is very rare. I have plan one day to build my own outdoor monitor based on their plans (as a project I don't have the usage)