Cameron aide said government was 'exposed on Heathrow' over air quality

As Theresa May prepares for airport expansion decision, memo emerges in which former PM was told he did not ‘have an answer’ on pollution concernsDavid Cameron’s No 10 policy chief warned him a year ago that he was “exposed on Heathrow” because the government did not have an answer to its impact on air quality, an internal Downing Street note has revealed.The memo was written by Camilla Cavendish, a former Downing Street adviser, who was scathing about the first dra