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Fewer than one in 10 people worldwide breathe air that meets WHO air quality guidelines. Can technology help fight the air pollution that kills millions of people a year?

Professor Niall Mac Dowell is a clean energy expert from Imperial College London. He tells Zoe Kleinman that one day we might have to pay to breath cleaner air.

Mexico City has cleaned up its act massively in the last three decades, but still faces major air pollution challenges. James Fredrick reports on the citizen projects which are helping to make pollution alerts a thing of the past.

After putting pollution trackers on London's pigeons in 2016, French start-up firm Plume Labs is now working on a version for humans. Would you pay to time your morning jog around the time when the air is at its cleanest?

Founder Roman Lacomb thinks the tech industry has to play a big part in the pollution solution.

(Picture: Air pollution in Beijing; Credit: GREG BAKER/AFP/Getty Images)