Nearly four times accepted levels of nitrogen dioxide levels around palace

Researchers found 152 milligrams of the gas per cubic metre of air around the palace - the EU legal limit is 40 Credit: Andrew Parsons/PA Archive

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.

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Highest air pollution in UK around Buckingham Palace

Buckingham Palace suffers from the highest level of air pollution in the country with almost four times the European legal limit.