In 2010, 33 percent of the urban population in developing regions lived in slums. In Sub-Saharan Africa, 199.5 million people or 61.7 percent of the total population lived in slums; Southern Asia had 190.7 million slum dwellers, or 35 percent of the total population.*
In 2020, more than 1.4 billion people live in slums — more than one in seven people worldwide. The megacities of the developing world are home to many of its most rapidly growing slums and much of its urban poverty. Since developing nations’ slums grow faster than their cities, they are overcrowded, polluted and dangerous, and often lack basic services such as clean water and sanitation. Slums have been called self-reinforcing “poverty traps.” Curtailing their growth and providing them with infrastructure and basic amenities become critical.
* “Ten urbanization statistics,” The Anthropocene Journal, http://anthropocenejournal.com/2012/03/29/ten-urbanization-statistics/.