Advanced diesel technology has virtually eliminated emissions of particulate matter, with 99% of these soot particulates captured by special filters fitted to all new diesel cars since 2011. Around half of diesels on the road now boast a diesel particulate filter (DPF).5
The latest Euro 6 vehicles are the cleanest in history – and light years away from their older counterparts. As well as special filters, they also feature clever technology that converts most of the NOx from the engine into harmless nitrogen and water before it reaches the exhaust.
Euro 6 technology works. Real world tests using the London 159 bus route show a 95% drop in NOx compared with previous generation Euro 5 buses. In fact, if every older bus operating in the capital were replaced with a Euro 6 version, total NOx emissions in London would fall by 7.5%.6
The latest Euro 6 cars are classed as low emission for the purposes of the London Ultra Low Emission Zone due to come into force in 2019, meaning drivers of these vehicles will be free to enter the zone without charge.
Contrary to recent reports, diesel cars are not the main source of urban NOx. In London, gas heating of homes and offices is the biggest contributor, responsible for 16%. While road transport as a whole is responsible for around half of London’s NOx, diesel cars produce just 11%, although concentrations will vary at different times depending on congestion. Keeping traffic moving is the key to keeping emissions low.7
In September this year, a new official EU-wide emissions testing system will come into force. This will involve, for the first time, on-road testing to better reflect the many and varied conditions involved in ‘real-world’ driving such as speed, congestion, road conditions and driving style. This will be the world’s toughest-ever emissions standard.
Mike Hawes, SMMT Chief Executive, commented: “Euro 6 diesel cars on sale today are the cleanest in history. Not only have they drastically reduced or banished particulates, sulphur and carbon monoxide but they also emit vastly lower NOx than their older counterparts – a fact recognised by London in their exemption from the Ultra Low Emission Zone that will come into force in 2019.
“Some recent reports have failed to differentiate between these much cleaner cars and vehicles of the past.
“This is unfair and dismissive of progress made. In addition to their important contribution to improving air quality, diesel cars are also a key part of action to tackle climate change while allowing millions of people, particularly those who regularly travel long distances, to do so as affordably as possible.”