Building an additional runway to address capacity constraints and meet future demand for air travel in and out of London has moved from a question of "if' to a question of "where". Studies have found that an extra runway could be added without jeopardising the UK's chance of meeting its emissions reduction targets - albeit to the detriment of further developing the country's regional airports, according to some. However, concerns over noise and local air quality could still prove difficult to overcome.
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