Pollution is the world's biggest killer. It caused 16 per cent of all deaths in 2015. Most people died from heart disease, lung cancer and stroke. Around 92 per cent of these deaths were in poor and developing countries. Bangladesh and Somalia were most affected by pollution. Brunei and Sweden were least affected.

A researcher said pollution was linked to poverty and poor health. He said it threatens human rights. Air pollution was the biggest killer. It killed 6.5 million people in 2015. The second biggest killer was water pollution. Next, was pollution in the workplace. A scientist said: "Air pollution is reaching crisis point."