Poor air quality is now one of the greatest threats to human health. That’s according to a study from the University of Chicago’s Energy Policy Institute. Researchers say air pollution cuts life expectancy by five years in South Asia, the worst affected region.

Two BBC reporters — Jaidaa Taha in Cairo and Trisha Husada in Jakarta — tell us what it’s like living in cities coping with high levels of pollution. And from Delhi our South Asia correspondent, Samira Hussain, discusses the startling impact pollution can have on health outcomes.

We also hear from Glory Dolphin Hammes — the CEO of IQAir, a tech company that monitors air quality in real time around the world.

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