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How can we solve our air pollution problem? The Government must make a decision on how to deal with nitrogen dioxide in the air. Today we are running the third and final report by Camilla Cavendish, former head of the Downing Street Policy Unit. She reports on how The Great Smog of 1952 galvanised politicians and what today's politicians can learn from it. (Image: Lord Nelson's statue with a breathing mask; credit: Getty Images)