I think people massive underrate how much air quality in most cities has improved just in the last twenty years. Whenever I go back to London now I’m always struck by the absence of smog that was a fact of life when I grew up there in the 2000s.
Air quality. I grew up in the Los Angeles basin in the 70s and 80s and remember having to stay inside because the smog was so bad - Stage 2 smog alerts, they were called. Apparently they haven't had one of those since 1988. Haven't had a stage one smog alert since 2003.