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It’s estimated that more than 9,000 Londoners die earlier than they should every year as a result of conditions associated with long-term air pollution. It’s a massive problem in the capital: in 2017, our city exceeded its yearly pollution quota within the first week of January. London is far more polluted than New York or Madrid, with levels in some areas approaching those seen in Beijing and Mumbai. But before we properly join the ranks of the world’s dystopic smog-choked megalopolises, a range of initiatives is bringing some leftfield technologies to bear on the problem, helping us all breathe a bit easier.