Almost everyone in Europe breathes highly polluted air leading to 400,000 deaths per year.
https://www.theguardian.com/environment/2023/sep/20/revealed-almost-everyone-in-europe-breathing-toxic-air
@ExtinctionR Solution: find the culprits and make them change their industrial procedures so the contamination could be minimized. Second step - repeat until the problem is solved and so on.
@ExtinctionR I will say when I traveled to Europe, was the only time where when I blew my nose, which I have to do everyday due to allergies, I blew black gunk out. No city in the US has ever made me do that.