How are cities around the world tackling air pollution?

More cycling, better public transport and car bans - cities from Delhi to Zurich are using a range of initiatives to lower traffic pollution and improve healthParis
Paris bans cars in many historic central districts at weekends, imposes odd-even bans on vehicles, makes public transport free during major pollution events and encourages car- and bike-sharing programmes. A long section of the Right Bank of the river Seine is now car-free and and a monthly ban on cars has come into force along the C