London Mayor Sadiq Khan has condemned the Government's decision to build a third runway at Heathrow and pledged to join any legal challenges against the project.
Mr Khan, who supported the expansion at Gatwick Airport, said: "This is the wrong decision for London and the whole of Britain."
A new runway at Heathrow will be devastating for air quality across London – air pollution around the airport is already above legal levels of NO2.
I will continue to challenge this decision and I am exploring how I can best be involved in any legal process over the coming months.
The decision to approve a third runway at Heathrow shows Britain can be an open, global, and successful country after it leave the European Union, Prime Minister Theresa May has said.
Speaking to the Evening Standard, Ms May said the decision showed the Government was willing to "take the big decisions".
"Airport expansion is vital for the economic future of the whole of the UK," Ms May said.
"Businesses will know that we are building the infrastructure they need to access global markets.
"This decision demonstrates that as we leave the EU we can make a success of Brexit and Britain can be that open, global, successful country we all want it to be."
Ms May continued that while the Government wanted the benefits of a new runway as quickly as possible, it would also a make sure London and taxpayers got a good deal.
CGI graphics reveal how the Heathrow third runway will look as the plans were given the green light.
Heathrow Airport released the CGI fly through of its expansion plans including footage inside a new state-of the art central terminal area.
Tory MP Zac Goldsmith intends to honour his pledge to resign and force a by election in Richmond Park and Kingston North in protest at the Heathrow decision, the local Conservative Association has confirmed.
The Government is to propose legally binding noise targets to provide respite for people living near Heathrow after a third runway was given the go ahead.
The Department for Transport added they would also propose a six-and-a-half hour ban on scheduled night flights from the airport.
The Department for Transport continued that the Government would publish a document in the new year on why Heathrow was the right choice, and that an additional study showed a new runway would be deliverable within air quality limits.
Richmond MP Zac Goldsmith has described the decision to confirm plans for a third runway at Heathrow as 'catastrophic'.
Following the Government's catastrophic Heathrow announcement, I will be meeting my constituents later today before making a statement.
Transport Secretary Chris Grayling has said building a third runway at Heathrow is the "clearest sign that this country is open for business" after the referendum.
He told ITV News Deputy Political Editor Chris Ship the Government's announcement was a "really big decision for this country".
We've thought long and hard about this. There were three very good options on the table but we believe a third runway at Heathrow is the best option for our future, it's the best for the whole country - it's going to create better connectivity to the different regions of the United Kingdom - and to provide the best trade links to the world.
Asked why the whole Cabinet couldn't support the project, Mr Grayling said: "It would be impossible to deliver a project like this without some people disagreeing with the strategy."
He said the third runway would "absolutely" be built.
The Government has confirmed it has chosen to build a third runway at Heathrow Airport as its preferred airport expansion project.
The Department for Transport announced the £17.6 billion project after a Cabinet meeting of the airport sub-committee chaired by Prime Minister Theresa May.
The other shortlisted options - to extend an existing runway at Heathrow or build a second runway at Gatwick - were rejected in favour of a decision that will see more than 780 homes demolished in west London.
Fierce opponents of Heathrow expansion within Cabinet, Foreign Secretary Boris Johnson and Education Secretary Justine Greening, will both speak out at the decision after being cleared by Mrs May to air their dissent.
The Government announcement ends more than a year of uncertainty since the Davies Commission came out in favour of Heathrow's third runway.
A public consultation will be held on the impact of the expansion before the final decision is put to MPs for a vote in the winter of 2017/18, with the runway unlikely to be in use before 2025.
Protests have been held at Westminster as the Government prepares to announce its long-awaited decision on airport expansion.
Transport Secretary Chris Grayling is expected to confirm plans for a third runway at Heathrow after a Cabinet meeting.
The Government is to choose which scheme to back after a review of the UK's airport capacity. Here are the three shortlisted options.Read the full story ›