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Diesel Emissions STILL Above The Legal Limit

New diesel cars are still emitting above the official limit for polluting nitrogen oxides when driven on the road, almost a year after the Volkswagen emissions scandal broke.

Renault, Mercedes-Benz, Mazda and Hyundai have all launched diesel models in 2016 with NOx emissions that are far higher than the official lab-based test when driven in real-world conditions, according to tests by Emissions Analytics (EA), a company whose data is used by the manufacturers of most cars sold in Europe.

Ironically, the only new model to meet the limit when on the road was a Volkswagen Tiguan.

Diesel cars must pass lab-based tests for NOx emissions but most cars perform far worse in the real world and in 2015 Volkswagen was caught using software to cheat the tests. Previous EA analysis showed 97% of diesels launched since 2009 exceeded the lab limit.

NOx pollution is a serious public health problem, causing the early deaths of 23,500 people a year in the UK alone. New research presented on Tuesday suggests the air pollution crisis in UK cities has not been tackled because politicians prioritise economic growth and road safety instead. The EU has tightened emissions regulations and, from September 2017, diesels that emit more than double the lab limit for NOx on the road will be banned from sale.

The Emissions Analytics’ road test is very similar to the new test the EU is implementing and it found that 2016 Renault Megane (1.5l engine) and Espace (1.6l) diesel models emitted more than 12 times the NOx lab limit in real-world driving.

A Mercedes Benz CLA (2.1l) diesel emitted 8-12 times the limit on the road, while a Mazda 3 (1.5l) and Hyundai Sante Fe (2.2l) emitted 6-8 times the limit. Until the testing regime changes in 2017, it is legal to sell such high emitters. In contrast to the other vehicles, the road emissions of the Volkswagen Tiguan (2.0l) met the lab limit for new cars.

Molden said the continued sale of highly polluting diesels reflected the struggle of some manufacturers to catch up and implement the emissions-reducing technology. Other carmakers, he said, have the technology in their cars already but are calibrating their engines to maximise fuel efficiency, at the expense of high NOx emissions.

But some, such as VW, had already delivered on the most recent standard, called Euro 6, Molden said. “There is a massive irony, given that VW are the ones that have been caught. But their Euro 6 cars from the get-go have been very clean and they came in before ‘dieselgate’ blew. It is an even bigger irony than it first looks – they had already cleaned themselves up before they got found out.”

Julia Poliscanova, from the campaign group Transport and Environment, said: “The current regulatory climate in Europe sees testing authorities protecting carmakers and allowing polluting vehicles to be sold, even after dieselgate.”

“New on-road tests after 2017 will help and are the only way to measure accurate real-world emissions,” she said. “But more action is necessary. In the short term governments must stand up for their citizens’ health and order mandatory recalls to bring illegally dirty cars in compliance.

“In the long term, more independent oversight, transparency and robust testing over vehicles’ lifetimes are necessary for Europeans to finally enjoy the cleaner air promised to them almost 10 years ago.”

Tamzen Isacsson, from the UK trade body The Society of Motor Manufacturers and Traders (SMMT), said: “We can’t comment on results from non-official tests where the robustness or methodology is unclear. However, SMMT and industry acknowledge the need for reform of the EU test process.

“We support the introduction next year of a more onerous lab test that better reflects real world driving, together with an on-road Real Driving Emissions (RDE) test. This will be the world’s toughest emissions testing regime.”

A spokeswoman for Hyundai said: “Hyundai Motor vehicles on sale in the UK meet all the current regulatory standards. New Euro 6 cars are built using the best available technology and they produce less NOx emissions than their predecessors.

“Hyundai Motor takes environmental compliance extremely seriously and is committed to meeting forthcoming new targets and to significantly improving the environmental performance of its vehicles.”

Spokesmen for Mercedes-Benz and Mazda said they were unable to comment on unofficial tests. The spokesman for Mazda added: “In compliance with the law, Mazda works hard to ensure that every petrol and diesel engine it makes fully complies with the regulations of the countries in which they are sold.”

Renault did not respond to requests for comment.

Molden said the new regime in 2017 would probably mean diesels at the smaller end of the range would no longer be sold: “Some of these cars will be discontinued because the after-treatment system will just be too expensive as a proportion of the total price to work commercially. But from mid-sized cars upwards it can be done. We are talking about adding hundreds of pounds per [car], not thousands.”

(Guardian, 2016)


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