Boris Johnson has criticised government plans to build a third runway at London Heathrow Airport, suggesting that it would adversely affect “millions” of Londoners.The mayor of the UK’s capital claimed that the expansion of the country’s largest airport should not be allowed if it contravenes existing European Union pollution laws.Praising the environmental secretary Hillary Benn’s comments, Johnson stressed that a third runway would mean an increased number of aircraft flying over his constituents in Harrow, Camden, Islington and Enfield.

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