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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Elizabeth Hurley told ITV News it was vital for those who survive the disease to continue to be supported after their recovery.
The mother of Shane Virami are taking Thomas Cook and a friend of his to court over his death.
The OktoberFest beer festival, due to take place this weekend, has been cancelled at the last minute.