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Jane Wakefield hears from Rahul Tandon in Kolkata about India’s air pollution nightmare, and from Robert Muggah of the Igarapé Institute in Brazil, who explains how interactive mapping can help pinpoint global pollution hotspots. Jane hears how local mayors are taking the lead on air quality issues from Shannon Lawrence, director of global initiatives for C40, a group which gathers together mayors to tackle climate change. (Photo: Resident in Linfen, in China's Shanxi province, regarded as one of the cities with the worst air pollution in the world, Credit: Getty Images)