Reality Check: How healthy is your commute?

Our cities are clogged with traffic and smog. What forms of transport in these urban environments expose you to the highest amounts of pollutants?

As the World Health Organization holds its first conference on global air pollution and health, Reality Check investigates commuting options.

Motion graphics by Jacqueline Galvin.

Additional production and filming by Shadab Nazmi and Piyush Nagpal.