I’m considering travel to Bulgaria and have read that Sophia is the most polluted European capital. Has anyone traveled there and experienced this?
Just depends. Sofia is in a valley, sometimes there is an inversion layer that traps the nastiness, sometimes not. It's certainly not like China or something. Sofia is a city only people who have done no research about Bulgaria stay in anyway.
I spent several days in Sofia, enjoyed it very much, and at least at that time, never sensed that it was particularly polluted. Air seemed fine. I loved Bulgaria!
I've been to Sofia in September, never felt that it was any different to any other major city.