I was in Paris this year and my nails were getting black just from the smog. My wife has long covid and even though she was moving around with wheelchair, we had to leave the city the 2nd day because she couldn’t breathe anymore and started to cough blood.

Of course she is very sensitive now, she can’t be even close to a person smoking or a bbq. But it’s also a good indicator of how bad is for your lungs to live in Paris ir any polluted city.