Sixty per cent of acute respiratory infections in children are caused by ambient environmental factors. This is highlighted by US research from the US National Institute of Environmental Health Sciences (NIEHS) and the Environmental Protection Agency (EPA), which make the point that we spend as much as 90 per cent of our lives indoors. At home, when travelling, at work or in public buildings.
This makes it crucial to focus on the health of the built environment, and according to the World Health Organization, there is plenty of scope for improvement. In a 2006 study, the WHO found that we are primarily exposed to air pollution when we are inside. Children are particularly exposed, as they have a higher breathing volume, and thus breathe in larger volumes of air than adults.