How to win the war on air pollution | Letters

Damian Carrington is half right (The war against air pollution has begun – and it will be fought in cities, 13 February) in that cities bear a terrible burden from air pollution and municipal action is critical to address it. However, city governments cannot succeed alone. Much of urban pollution stems from outside city limits and significant progress will only be achieved with policies that also require national, regional and even international commitment.A significant part of city air po