What would a smog-free city look like?

Forget ‘solutions’ such as smog towers, air-filtering buses and pollution-eating paints. We need to prevent the air pollution in the first placeThe persistent haze over many of our cities is a reminder of the polluted air that we breathe. Over 80% of the world’s urban population is breathing air that fails to meet World Health Organisation guidelines, and an estimated 4.5 million people died prematurely from outdoor air pollution in 2015.Globally, urban populations are expected