In the 21 worst-affected countries, close to 5% of death and disease is caused by indoor air pollution, according to new estimates published by the World Health Organization (WHO).

The first-ever country-by-country estimates of the burden of disease due to indoor air pollution highlight the heavy toll solid fuel use takes on the health and well-being of people around the world.. The countries most affected are Afghanistan, Angola, Benin, Burkina Faso, Burundi, Cameroon, Chad, the Democratic Republic of the Congo, Eritrea, Ethiopia, Madagascar, Malawi, Mali, Mauritania, Niger, Pakistan, Rwanda, Senegal, Sierra Leone, Togo and Uganda.

In 11 countries - Afghanistan, Angola, Bangladesh, Burkina Faso, China, the Democratic Republic of the Congo, Ethiopia, India, Nigeria, Pakistan and the United Republic of Tanzania - indoor air pollution is to blame for a total of 1.2 million deaths a year. Globally, reliance on solid fuels is one of the ten most important threats to public health.