Three charts from the world of research, selected by Nature editors.
. NTDs are a group of around 20 conditions that affect more than one billion people worldwide. Treating populations with preventive medication is effective at tackling diseases such as lymphatic filariasis ; improving water, sanitation and hygiene can help to curb waterborne diseases.
Indoor air pollution is a major public-health problem, and this graph shows how sources of pollutants are changing in England. Emissions of volatile organic compounds from cosmetics and personal-care products have risen, as have pollutants associated with wood burning — which is now popular. Levels of some other pollutants, meanwhile, have declined. But much
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