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Scotland Yard is launching a ‘green revolution’ with a new fleet of hundreds of hybrid electric cars to help combat London’s toxic air crisis.

The force is planning to put 250 alternative energy cars on the roads within 12 months in the first stage of a major overhaul of its 4,000 or so vehicle fleet.

They will include revolutionary hydrogen fuel cell vehicles being used as emergency response cars for the first time in the UK.

In addition, more than 30 hybrid electric cars will be rolled out across London boroughs to respond to 999 calls.

Among other options being tested are hydrogen scooters for PCSOs patrolling bus lanes and roads.

The Standard can also reveal that Met chief Sir Bernard Hogan-Howe spoke to Elon Musk, the billionaire chief executive of electric car maker Tesla, about trialling his cars for front line operations.

The moves come as London is facing increasing fears over levels of pollution with a series of toxic “black” alerts over air quality in recent weeks.

The Met say officials are working with Mayor Sadiq Khan who has stepped up measures to combat pollution with plans for five low emission neighbourhoods spanning eight boroughs.

The force, which has stopped buying new diesel cars, wants to put around 250 hybrid electric or alternative energy vehicles on the roads in London in the next 12 months.

The force is planning to test vehicles in the low emission areas in central London where it is hoped around half of all police cars will be hybrids by next year.

The move is part of a £21 million programme to replace 700 of the Met’s 4,000 or so vehicle fleet in 2017/18.

Senior officials say they are in discussions with nearly all major car manufacturers including Ford, Mercedes, Nissan, Renault and VW to test vehicles ranging from cars to mopeds and vans.

Pollution in London 6 show all Pollution in London 1/6 This image taken near the Royal Observatory in Greenwich shows a thick layer of smog hanging over London Anna Rolls 2/6 This image, taken in December 2016, shows the smog over London Pete Buckney 3/6 This shot taken in 2015 from Hampstead Heath shows smog hanging over the centre of London Getty Images 4/6 Pollution: thick smog hangs over London's Docklands PA 5/6 Pollution hanging over the City of London 2011 FILE IMAGE AFP via Getty Images 6/6 Smog: A thick layer of smog visible above London's skyline William Smith/@williamsmithorg 1/6 This image taken near the Royal Observatory in Greenwich shows a thick layer of smog hanging over London Anna Rolls 2/6 This image, taken in December 2016, shows the smog over London Pete Buckney 3/6 This shot taken in 2015 from Hampstead Heath shows smog hanging over the centre of London Getty Images 4/6 Pollution: thick smog hangs over London's Docklands PA 5/6 Pollution hanging over the City of London 2011 FILE IMAGE AFP via Getty Images 6/6 Smog: A thick layer of smog visible above London's skyline William Smith/@williamsmithorg

The force is working with Suzuki on a trial of a hydrogen scooter as well as testing Toyota’s £66,000 Mirai hydrogen cell car as a front line response vehicle.

So far, tests involving a £30,000 BMW i3 Range Extender, which can do O-62mph in 7.3 seconds, as a fast response car have proved successful in several Met boroughs.

Now the force is planning to trial five hydrogen powered vehicles as emergency response vehicles, though the pilot scheme will be limited to areas close to the five hydrogen cell charging points in the capital.

Police say they could have 32 hybrid electric front line response cars deployed in London by next year with trials under way in Westminster, Wandsworth, Greenwich, Bexley and Lambeth.

Electric vans are planned for scenes of crime officers and Royalty protection officers are to get 10 hybrid vehicles.

Jiggs Bharij, the head of the Met’s fleet services, said: “The response from police drivers to the BMW i3 has been very positive. It’s actually a very quick car.”

He said the Met was examining different “plug-in hybrid technologies” and hydrogen and compressed natural gas as possible alternative fuels.

He said: “We have to make sure that we have an operational police fleet which can respond to 24/7 policing, that is our top priority.”

Police said the initial cost of buying alternative energy cars will be higher but claim the costs even out in the long term.

Mr Bharij said: “We have an ambition to deploy 250 alternative energy cars, vans and motorcycles on the road within the next 12 months.

"To support this we need to make sure that there are charging points available across the estate and that the vehicles are capable of carrying and powering additional police equipment which enables officers and members of the public to remain safe at the scene of an incident.”

He said the Met had stopped buying diesel cars in 2015 and were talking to nearly all manufacturers about testing cars for police use.

He added: “The Met is leading the way certainly in the police sector. Our aim is to make the fleet as clean as we can whilst maintaining operational capability and we are working with the Mayor on his new low emission zones and the fleet deployment will compliment the low emission neighbourhoods.

“These first vehicles are a stepping stone that will allow us to build the volume over time once we have the right technology and infrastructure in place.”

London Assembly Green Party member Sian Berry said: “A lot of new and positive ideas are being trailed and considered by the Met here.

“But what we need from them is a firm deadline for getting all diesel police vehicles off the road. Every organisation with a fleet in London needs to be making plans for this to happen as soon as possible, and this needs to start with the Mayor’s own bodies, including TfL and the Met.”