Five years after São Paulo, Brazil, began fighting visual pollution by banning billboard, poster and bus advertisements, people report being happier with their city and business leaders have become more forward thinking. The ban was the result of the 'Clean City Law' of 2006 which required the removal of tens of thousands of unregulated advertisements. "Anna Freitag, the marketing manager for Hewlett-Packard Brazil, said her company had never considered how inefficient billboards and the like were until they were illegal."