New research suggests a third runway at Heathrow could cause an extra 100 deaths a year linked to pollution from the airport.
The report, by Cambridge University and the Massachusetts Institute of Technology, shows a plan backed by mayor Boris Johnson for an airport in the Thames Estuary, would cut the number of deaths.
Scientists say the estuary scheme would see a 70% decrease in the number of people dying due to pollution caused by Heathrow.
Piers Hopkirk has our report:
More top news
Tottenham Hotspur have unveiled exclusive images from inside their new stadium.
Sadiq Khan has announced tunnelling to extend London Underground's Northern line will begin in March.
CCTV has been released of a man police wish to speak to after an attempted burglary in Putney.