I am generally not into "connect it all to the cloud" either, but I want to point out that cloud connected outdoor air quality sensors like Purpleair are tremendously valuable to society. Living in a wildfire prone CA, I am constantly monitoring PA sensors in my area to determine if it is safe to exercise outdoors.
I agree, and am happy to see this data out there and (mostly) in the open. In my area, there's a bunch of such stations operated by a certain local startup, so I have all the outdoor data I need. I might one day add a sensor of my own to that map (in the past, I briefly used to run a sensor for Luftdaten project) - but at this point, I want to measure indoor data, and adding those to the public maps will only introduce noise, providing negative value to the public.
