The Caribbean? Go to Taipei or any city in China if you want to see SMOG. Going for a short walk there is worse than smoking a pack of cigarettes. I've had pretty significant reactions there...I usually try to just stay in my hotel when I'm in those places. There is nothing like that in in the US. Nothing. We are way ahead when it comes to taking care of the environment. Tokyo used to be that way, but it is great now--very clean. Seoul is half-way there. China and Taiwan are the big offenders.