In 2005, one out of three urban dwellers was living in slum conditions that is, lacking at least one of the basic conditions of decent housing adequate sanitation, improved water supply, durable housing or adequate living space. Even if the growth rate of slum dwellers decreases, the rapid expansion of urban areas will make it challenging to improve living conditions quickly enough to meet the target…. In countries including Chad, the Central African Republic and Ethiopia, four out of five urban dwellers live in slums. In most of Asia and in Latin America, where the majority of urban dwellers have access to improved water and sanitation, slum conditions are characterized mainly by overcrowding and makeshift shelters. The non-durability of housing, in fact, is a problem for an estimated 117 million people living in cities of the developing world. Over half of these people live in Asia; Northern Africa has the fewest people living in non-durable housing. In 2005, about one fifth of the urban population in the developing world lived in overcrowded houses (with more than three persons sharing a bedroom); two thirds of them were in Asia, with half in Southern Asia.*

*The Millennium Development Goals Report 2007 MDG Report