KHARTOUM: The capital of Sudan, whose president is wanted by the International Criminal Court on charges of genocide and war crimes, falls fourth to last on Mercer’s cities index. The average temperature hovers at 100 degrees Fahrenheit. A two-decade-long conflict in southern Sudan killed 1.5 million people, and, later, an eight-year-long conflict in Darfur has killed some 300,000. Like Khartoum, many of the African cities lack of adequate modern infrastructure combined with relatively high air pollution. Here, young girls wash clothes in the Nile River in Khartoum on May 4.