Mayor of London, Sadiq Khan, a group of London councils and environmental charities, have successfully won their case in a Court of Appeal preventing the Heathrow expansion.
Khan tweeted: “We won! Today we blocked the Tory government plans to build a third runway at Heathrow Airport.
“Today’s judgment is a major victory for all Londoners who are passionate about tackling the climate emergency and cleaning up our air."
The London Mayor, alongside a group of councils and environment charities, appealed the High Court decision made last May.
The proposal to expand the airport was pushed through in a Commons vote in June 2019, with a majority of 296 voting in favour.
Transport secretary, Chris Grayling, was criticised for not giving sufficient consideration to climate change issues or environmental legislation.
According to Lords Justice Singh, Lindblom and Haddon-Cave, the government did not consider their commitment to the Paris Agreement when supporting the airport expansion in their National Policy Statement.
The UK ratified the Paris Agreement in 2016, which commits all signatories to taking measures to preventing global warming from increasing by two degrees Celsius.
Lord Justice Lindbolm said that "the Paris Agreement ought to have been taken into account by the Secretary of State in the preparation of the NPS and an explanation given as to how it was taken into account, but it was not."
Boris Johnson previously voiced his opposition to the Heathrow expansion, vowing to "lie down ... in front of those bulldozers" to prevent the runway from being built.
In an interview yesterday, the CEO of Heathrow airport, John Holland-Kaye, asked the prime minister to speed up plans to build the runway.
Peter Walker, political correspondent for the Guardian, has stated that the government will not appeal the court ruling at present.
