Air pollution 'silent killer' in African cities: study

Pollution in Africa's fast-expanding cities is deadlier than thought, yet green solutions could save tens of thousands of lives and avert billions of dollars in damage, a report said Thursday.

"Air pollution (in African cities) is high and rising, it's rising pretty quickly," said Desmond Appiah, Ghana director at the Clean Air Fund, a British NGO which published the study. "It is a silent killer."