This week, Christiana, Tom and Paul explore the public health epidemic that is air pollution. We ask why it has taken so long for people to wake up to the fact that air pollution has such a devastating impact, especially on children, and we explore how climate politics are transformed if we bring air pollution into the discussion. We then talk to Dr Arvind Kumar, lung surgeon from New Delhi about finding black lungs inside non-smoking teenagers and what it will take to make a shift.