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> let's not ignore the local effects: air quality in Germany is pretty bad, perhaps the worst in Europe

What... you know you could've looked this up pretty easily before posting?

Both Berlin and Munich rank higher in terms of dirty air than the first polish city, Wroclaw: https://www.iqair.com/world-air-quality-ranking

That's LIVE data that will change hour to hour. When I opened it the list looked very different.

I provided you a map showing historical data collected over a year.

That's a real time map that will change by the hour. What I see now is probably not what you saw when you opened it.