A few reasons I don’t generate data. It’s a lot of work especially validating it’s correct. Also if a user reports it’s inaccurate or something is not right, it’s a lot of work trying to figure out if it’s an error in my generation or a consequence of the original input data. But the big one is that I can say “I don’t generate the data, email NOAA” when a user emails about inaccuracies 
Yes, I looked at AQICN and briefly thought about buying a unit. I just bought a lightning detector. I can certainly add this data but the code to add data at point locations on the map with numbers is not implemented. This would take weeks/months to do. The main data Flowx can cope with easily is map data that covers regions or the whole earth. I think there is map data for air quality out there. I think it’s measured by satellites.
I’ve also thought about adding earthquake data, again these are point locations and the code isn’t in place to render them.