I have lived in multiple cities and multiple exurbs, at sea level and at a ski resort town (7000+ ft above sea level). I would make these claims instead: -

I have lived in multiple cities and multiple exurbs, at sea level and at a ski resort town (7000+ ft above sea level). I would make these claims instead: - people at altitude spend more time indoors avoiding extreme weather caused by the altitude - o2 levels to the brain are not significantly different for people whose bodies have adjusted to the altitude already - people who live at altitude are more likely to be more active - cities in modern western countries are largely clean of major sources of air pollution (one of the few things NIMBYs are good at) - cities in developing countries (eg. Pakistan, India, China) are incredibly different - rural areas are largely clean of air pollution except in hotspots (eg. factories and mines) - your doctor likely doesn’t do actual science (“explore relationships”), but rather just disseminates the evidence that others have already recorded - your doctor likely works in the USA where we pay fee for service. Maybe you should look at how single payer systems align healthy patient long term outcomes align with the single payer total costs.