London's congestion charge has increased pollution, study finds

File photo dated 08/08/14 of a congestion charge sign in London. Foreign embassies and international organisations have racked up debts on unpaid congestion charge totalling more than £100 million since the levy's introduction in London in 2003, Boris Johnson has disclosed.
File photo dated 08/08/14 of a congestion charge sign in London. Foreign embassies and international organisations have racked up debts on unpaid congestion charge totalling more than £100 million since the levy's introduction in London in 2003, Boris Johnson has disclosed.

London's congestion charge, introduced in 2003, has actually increased diesel pollution in the capital according to university researchers.

Scientists from Lancaster University, the University of Wisconsin-Milwaukee and the Norwegian University of Science and Technology presented a study on the matter at the Royal Economic Society's annual conference.