A council is to crackdown on "polluting" diesel cars by imposing a 50% parking surcharge on drivers.
Westminster City Council will be the first in Britain to impose the extra charge on diesel drivers in a bid to cut air pollution.
Council bosses will deter diesel drivers from entering the borough by charging them 50% extra on top of the current rate of £4.90-an-hour to park.
Councillor David Harvey, Westminster’s Cabinet member for environment, sports and community, said: "Residents and visitors tell us all the time that air quality is a key concern in central London."
Cllr Harvey added: "Additional charges for diesel vehicles will mean people think twice about using highly polluting cars and invest in cleaner transport that will make a real difference in the quality of air we breathe."
The council has said the initiative is part of its "drive to create a greener, healthier city".
The emissions-based charging for diesel cars will apply to motorists parking within Marylebone .
The pilot programme will be introduced from April 3 2017 and will see the charge for pay-to-park bays during normal parking hours increased specifically within F zone for diesel cars, which the council labelled as "some of the heaviest polluting vehicles".
It will apply to visitors into Marylebone, with resident permits remaining unchanged.
A spokesman for the council said: "Customers are currently able to Park and Pay per minute up to a maximum of 240 minutes (four hours), meaning charges will be 8p per minute in real terms and 12p per minute for diesels.
"Marylebone suffers some of the highest pollution levels in London, given the area’s location, mix of land uses, building density and type, and number of vehicle trips.
"A “polluter pays” principle will have the aim of reducing harmful vehicle emissions in Marylebone and any money raised will be spent on initiatives to promote sustainable transport."
Kay Buxton, from the Marble Arch BID (Business Improvement District), said: “As one of the three Business Improvement Districts in the Low Emission Neighbourhood, Marble Arch London is committed to improving air quality locally.
"We welcome Westminster’s first step to addressing air pollution through differential parking charges and hope to see a resultant behaviour change across the Neighbourhood, with people choosing not to bring diesel vehicles into the area.”
Tim Carnegie, chairman of Marylebone Association, said: "Marylebone residents' are pleased that the Low Emission Neighbourhood is taking action to deter visiting diesel vehicles from driving into our community.
"Making the polluter pay is just one of the positive steps that is required to bring about necessary behavioural shifts and improvements in our local air quality."
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