Visitors waiting to see the changing of the guard on Thursday got more than they bargained for.
The 50 most polluted roads in the UK are all in London. Even number 50 on the list is two and a half times the legal EU level.
Teenager Malala Yousafzai burst into a fit of giggles when she met the Queen and the Duke of Edinburgh at Buckingham Palace.
Royal mail spokesman Andrew Hammond said: "This stamp issue illustrates the development of Buckingham Palace from the private house built by the Duke of Buckingham 300 years ago to one of the most iconic buildings in the world."
He added: "Buckingham Palace is one of the most recognised landmarks in the UK and is a source of pride to the nation; it forms a huge part of our heritage, so it's fitting Royal Mail has been able to dedicate a stamp issue to this most famous of addresses."
The Queen's face can be found on every stamp issued in the United Kingdom, and now you can see her primary residence when you send a letter as well.
The Royal Mail has release a 10-stamp set of images celebrating Buckingham Palace, which has been the official London residence of British sovereigns since 1837.
The set includes six stamps featuring watercolours of the exterior of the building through the ages, commissioned by Royal Mail from artist Chris Draper.
– A spokesman for Boris Johnson
Since the Mayor was elected, NO2 emissions have reduced by 20 per cent and the number of people living in areas exceeding NO2 limits has halved but he fully recognises the need to take further action.
This includes the introduction of the world's first Ultra-Low Emission Zone in central London from 2020, tougher requirements for taxis from 2018 and a £20million fund to tackle local problem areas.
These most ambitious measures will deliver enormous economic and environmental benefits for central London and will make this global city an even better place to live, work and visit.
The toxic gas nitrogen dioxide (NO2) can lead to respiratory disease and can cause the lining of the lungs to become inflamed.
The government is the subject of legal action after failing to deal with the high level of the toxic gas in the country's cities.
Most British cities have plans to reduce traffic fumes to within the legal limit by 2020, however London has insisted that it could not meet the NO2 targets set for it in 1999 until at least 2025.
London has the highest levels of NO2 of any European capital city and the UK has the highest proportion of zones breaching legal limits.
Other highly polluted areas include Oxford Street near Marble Arch, which registered at 150 micrograms, and Cockspur Street near Trafalgar Square on 138 micrograms.
The fourth and fifth locations were Park Lane and Knightsbridge - which measured 135 and 134 micrograms respectively.
Grosvenor Place, which runs alongside the Queen's London residence, had the highest level of the toxic gas nitrogen dioxide in 2012.
Researchers found 152 milligrams of the gas per cubic metre of air, with a main contributor being diesel engine fumes. The EU legal limit is 40.
Sentencing Belmar to 16 months behind bars, Judge Michael Gledhill said that the knifeman had a 'fixation' with Buckingham Palace.
The potential grave danger, either to yourself or others was obvious by what you did.
There are countless other people in exactly the same situation as you following the relatively recent changes to the country's benefit system.
But they don't all arm themselves with knives and go to Buckingham Palace, intending to trespass within the grounds or enter the palace themselves. That is why what you did could be described as a stunt.
A knifeman who tried to break into Buckingham Palace to complain about his benefits being cut has been jailed for 16 months. 44-year-old David Belmar jumped over a barrier armed with a six inch knife in October last year.
Belmar was rugby tackled to the ground by armed police in the palace forecourt. Horrified tourists and their children looked on at the gates. The knife was found hidden inside a plastic bag in his jacket pocket.