Rio de Janeiro
Rio has more people living in slums than any other city in Brazil, according to the 2010 Census. More than 1,500,000 people live in its 763 favelas, 22% of Rio's total population. São Paulo, the largest city in Brazil, has more favelas (1,020) in sheer numbers, but proportionally has fewer people living in favelas than Rio.
Belford Roxo, Rio de Janeiro
Belford Roxo () is a city in the state of Rio de Janeiro, Brazil. It is a part of the metropolitan region of the city of Rio de Janeiro and was created in 1990. Its population was 495,694 in 2011 and its area is 79 km². Belford Roxo is not one of the richest and wealthiest cities in the state, due to its low GDP and relatively high population. Its climate is tropical with an average temperature of 18 °C (63 °F). Bayer and Lubrizol are the biggest companies in the municipality. It was named after Engineer Raimundo Teixeira Belfort Roxo. While serving as General Construction and Building Inspector for the city of Rio de Janeiro, Engineer Belfort Roxo, together with Engineer Paulo de Frontin, solved the water shortage problems of the area during the summer of 1889.