In 2006, Gilberto Kassab, mayor of São Paulo, Brazil, passed the “Clean City Law.” Citing growing concerns about rampant pollution in his city, Kassab decided enough was enough. But this was no ordinary piece of pollution legislation. Rather than going after car emissions or litterbugs, Kassab went after the billboards. Yes, you read that right: Kassab wanted to crack down on “visual pollution.”
According to a page linked from the article above:
Walker-Smith says we’ve gone from being exposed to about 500 ads a day back in the 1970’s to as many as 5,000 a day today.