Unbreathable: Cities on the Verge of Asphyxiation

Atmospheric pollution affects 9 out of 10 city dwellers, and kills 7 million people a year. Faced with this growing concern, how can people protect themselves? An investigation into pollution without borders.

With an epidemic of cancers among adults, and widespread asthma among children, China and India are on a constant health alert. Nor is the rest of the world free from harm as the pollutants are traveling.