According to the World Health Organization, polluted air causes premature death of 7 million people every year. We’ve long known that air pollution causes many health problems, including lung cancer, but how the two are linked has been a mystery. Last week, a team from the Francis Crick Institute and University College London presented results that shed new light on the role between air pollution and lung cancer. And in doing so, it may force us to rethink how cancer develops.

Madeleine Finley talks to Guardian science correspondent Hannah Devlin about how scientists discovered the link and what it could mean for the future of the field.

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