According to Time Magazine, the Mayor of Sao Paulo banned most outdoor advertising two years ago, “in a bold effort to rid the city of what he called ‘visual pollution.'” You can check out some images of the new Sao Paulo at the Time link.
I have a special interest in pulling the plug on much of the advertising to which we are exposed (and see here and here), especially advertising in public spaces. I think of it as corporate graffiti. And see here, regarding advertising aimed at children.