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Which? Figures Reveal Diesel Cars Can Emit 9 Times The Limit For Harmful Emissions

Official tests show diesel cars on British roads can emit over nine times the level of dangerous pollutants allowed

Which? consumer group carried out research by experts who tested 278 diesel cars between 2012 and 2016

The conclusion was that there were specific problems with Jeep, Renault and Nissan vehicles, although the problem was omnipresent

Eleven older diesel Renault cars tested by Which? had NOx emissions that were an average of four times higher than the Euro 5 limit

VW has also come under scrutiny for fitting devices which cheated official emissions tests to make the NOx levels look lower than they were

The EU has tightened the emission levels permitted by new cars six times since 1993 to protect public health

All the cars tested by Which? met the required standards during official examinations. But there is no legal requirement to hit these levels once the cars are on the road

Five more modern Renault’s, sold since 2015, had NOx levels that were an average of nine times the Euro 6 limit. The Renault Grand Scenic 1.6 dCi 130 produced 0.73g/km of NOx. Six Nissan cars with Euro 5 diesel engines had average NOx emissions that were 4.4 times the limit allowed in official tests

Producing some of the highest emissions in the test were Jeep, two of Jeep’s older models emitted an average of 1.74g/km which equates to nine and a half times the EU5 limit they met in official tests

Which? tested 31 BMW cars, which had some of the lowest ‘real world’ NOx emissions for diesels.

BMW average was 0.41g/km which equates to 2.3 times the test limit for EU5 cars, although more recent BMW models had an average of 0.14g/km which is 1.75g/km times the EU6 standard

September will see new tests which will be able to assess real driving emissions and car performance

So what did the manufacturers say?

‘Since mid-2015, Groupe Renault has committed to improve the performance of its anti-pollution systems. The vehicles tested by Which? would not have benefited from this improvement plan.’ – Renault

‘All our vehicles sold in Europe meet the Euro 5/6 emission standards. This [Which?] report shows significant variances for most brands tested.’ – Nissan

Jeep failed to give a response

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