Researchers in the US have developed bio-based air filters that they claim can capture toxic chemicals that current filters can’t.

As air pollution is largely considered to be an outdoor problem, people are little aware of indoor contaminants . The World Health Organisation estimated that each year 4.3 million people die of exposure to household pollutants.

Efforts to make buildings environmentally sustainable often focus on the technical side, such as energy efficiency. But there is more to sustainability than just energy efficiency.