The kitchen window of Virginia and Arwie Nell’s modest home in Kriel, Mpumalanga, offers a view of the mountain-like Matla power station in the distance.

"Some days there’s pitch-black smoke coming out, other days it’s grey, other days it’s yellow," says Virginia. "I have no idea what it is, but there’s definitely an acid-type smell. If the wind blows in this direction, it burns. You cough and your throat is sore."..

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