SmogMeter

It collects (merges) data from different sources:
* world:
* radioactiveathome
* DarkSky: UV index, cloud cover, visibility...
* Foreca: max/min world temperature
* NOAA solar wind, magnetic activity, and alerts
* seismicportal.eu: earthquakes
* Europe:
* Airly (Europe)
* European Environmental Agency
* Poland:
* polish government's environment service (Poland)

See also help within app (much more detailed than this info).

This app is available for Windows 10 since February 2019; now it is made universal using Platform Uno. Some features are not available for Android (yet), e.g. choosing point using map; communication with other apps; Live Tiles.
Google policy forbids this app for users age below 13 years.