Soon, air pollution could be measured on every street corner

Air pollution is responsible for 550,000 premature deaths a year in Europe and 7 million worldwide, according to the WHO. Measuring it can be a challenge, however, as the equipment tends to be large and expensive. But soon, this may change, thanks to a small, optical nanosensor developed at Chalmers University of Technology, Sweden, which can be mounted onto an ordinary streetlight.