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You don't need any fancy air monitoring technology to know that London is one seriously polluted city. But given that pollution kills up to 9,500 people per year in the capital, it would help to have a better idea of just how much pollution we're dealing with. London mayor Sadiq Khan has ambitious plans to tackle the problem and has already introduced a £10 T-charge on the most polluting vehicles, as well as displaying toxic air warnings at tube stations and bus stops when pollution is due to reach dangerous levels.
But now there's a campaign to create a map of London's air pollution levels using real-time data, to help Londoners know just how smog-filled their local area is. Drayson Technologies has launched Map London, a street-by-street air map of the city's pollution levels. They're calling on volunteers to be equipped with personal air pollution smart sensors, known as 'CleanSpace Tags', to help track levels across London.
The campaign is being supported by Greenpeace and the British Lung Foundation, and you can sign up here to do your bit to help Londoners breathe easy.
Find out more about Map London
Or read about the air pollution-monitoring clothes that are coming to London