DR NEIL OVERY / SCIENCE PHOTO LIBRARY DR NEIL OVERY / SCIENCE PHOTO LIBRARY
Abandoned coal slag heap. Close-up of an abandoned coal slag heap near Witbank, Mpumalanga, South Africa. Slag heaps like this often contain toxic heavy metals and pose a serious health risk to people living nearby. According to a European Union research team, the area around Witbank is said to have the most polluted air in the world.
Model release not required. Property release not required.