I wouldn't spend more time on underground transportation systems than I had to. https://nypost.com/2023/05/13/subway-has-alarmingly-high-pollution-levels-study

I wouldn't spend more time on underground transportation systems than I had to. https://nypost.com/2023/05/13/subway-has-alarmingly-high-pollution-levels-study-finds/ https://nypost.com/2023/05/13/subway-has-alarmingly-high-pol...