Many people are now very sensitive to air quality. There are various local measuring stations that provide the values decentrally. These are grouped under one roof in the Airvisual app.
You can create your own favorites and see the cities you have observed listed at a glance.
The values that Airvisual outputs come from various sources: local measuring stations, official bodies and derived from satellite images. The app shows the values according to the scheme of the international Air Quality Index. This ranges from 0, which corresponds to good air quality, to 500+ on the other spectrum. In this case, severe health problems are to be expected and it is better to stay at home.
The best weather stations 2021 with app: purchase advice and market overview