If you by "clean" mean what you see, litter etc. I'd go
with al, there are no or at least very few cities that
deserves the attention of "cleanest". However, if
you look at pollution and environmental issues, up
around here (Jarabacoa) is VERY clean! Now I'm talking
laboratory analysis of air and water, as well as the type of
litter that dominates (bio-degradable or not). It might LOOK
equally dirty with plastic packages as with platano peels
on the street, but enveronmentally it is of course a HUGE
differrence!
Not that Jarabacoa is a big city, more a village. Still I
wake up every morning and maze over the fact that human
"civilization" still haven't managed to do any serious
ecological harm here yet.
It might come, though. It seems there are serious plans to
MOVE the Yaque, which, of course, will kill off most
life around...