Hacker News new | past | comments | ask | show | jobs | submit login

Somewhat related: Fine particles (PM2.5) pollution in subway stations can be 30 times higher than in the urban roadside air above ground.

https://www.theguardian.com/uk-news/2019/jan/09/london-under...






Yeah you can sometimes see it in the tunnels. One really should be able to see pollution in like 20 meters of air...



Guidelines | FAQ | Support | API | Security | Lists | Bookmarklet | Legal | Apply to YC | Contact

Search: