[guil177]

It is funny to call fueling racism when saying Paris is particulatly dirty while at the same time admitting it cannot be compared to city like tokyo. Because I guess if compared then it would look particularly dirty.

By the way seoul is also way cleaner than Paris, I believe Singapore too.

[phs318u]

Having been to Tokyo, Singapore and Seoul, I can categorically say that Seoul is not in the same league as the other two. Having said that, all three are far and away cleaner than my city of Melbourne, Australia, which has taken an absolute dive in the last 15 years (I've been studying and working in the CBD for 40 years).

[KptMarchewa]

Seoul has the problem of regular sewage smell overall.

[throwaway2037]

Holy crap -- I have posted so many times today and I forget to mention Singapore (and Hongkong). Hat tip to you, sir/madam. Singapore's subway is very clean. In my experience, the total system load is way higher in Hongkong, but they do a tremendous job keeping it clean.