You seem to have a very dim view of cities as medieval hellholes where people are dying of plague in streets filled with sewage under skies choked with soot. Modern cities are not unhealthy places. Life expectancy in New York City[0] compares favorably to most states[1], and this is 2020 pandemic data, where you might expect cities to fare relatively badly.

[0]:https://www.nyc.gov/site/doh/about/press/pr2023/2020-vital-s... [1]: https://www.cdc.gov/nchs/pressroom/sosmap/life_expectancy/li...