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Euro 6 is reducing NOx, but diesels still underperforming

By / 5 years ago / Latest News / 1 Comment

While homologation testing takes place in a laboratory, Emissions Analytics uses a Portable Emissions Measuring System (PEMS), which analyses the content of the exhaust gases over a standardised on-road route.

Euro 6 set much stricter limits for nitrogen oxides (NOx) emissions from diesel vehicles, from 0.18g/km to 0.08g/km, but did not move the limit for petrols, which is 0.06g/km. NOx has been proven to cause respiratory problems in humans.

Emissions Analytics said the systems used to meet Euro 6, most commonly selective catalytic reduction (using a urea-based solution) or lean NOx trap after-treatment technology, was proving effective. Four vehicles have already met the 0.08g/km limit during the on-road testing, whereas only one of the Euro 5 compliant vehicles met the 0.18g/km limit during PEMS testing.

The average NOx emissions for Euro 6 vehicles is still high, at 0.340g/km – more than four times the limit, but a 54% reduction on the 0.736g/km averaged by Euro 5 models. Emissions Analytics added that the issue was much less for petrol vehicles, which are on average 24% below the 0.06g/km limit, but 22% did not meet this requirement.

Emissions Analytics recently launched an online database of its results on its website, aimed at helping the industry and businesses to get a clear picture of real-world exhaust content. This will be updated in real-time as new results are gathered.

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Alex Grant

Trained on Cardiff University’s renowned Postgraduate Diploma in Motor Magazine Journalism, Alex is an award-winning motoring journalist with ten years’ experience across B2B and consumer titles. A life-long car enthusiast with a fascination for new technology and future drivetrains, he joined Fleet World in April 2011, contributing across the magazine and website portfolio and editing the EV Fleet World Website.