Error parsing XSLT file: \xslt\FacebookOpenGraph.xslt Euro 6 diesel cars 'emit double NOx of trucks'
Cookies on Businesscar

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive all cookies on the Business Car website. However, if you would like to, you can change your cookies at any time

BusinessCar magazine website email Awards mobile

The start point for the best source of fleet information

Euro 6 diesel cars 'emit double NOx of trucks'

Date: 06 January 2017   |   Author: Daniel Puddicombe

Euro 6 diesel cars emit twice as much nitrogen oxide per litre of fuel than trucks and buses in real-world driving conditions, new data has claimed.

According to research from the International Council on Clean Transportation - a body heavily involved in exposing Volkswagen's dieselgate scandal - heavy-duty trucks and buses emit 210mg of NOx per kilometre in real-world conditions, compared with the 500mg NOx/km pumped out by Euro 6 diesels in the same conditions.

The group put the large difference down to the differing testing regulations. Since 2013, mobile testing devices became mandatory during bus and truck testing so that randomly-selected vehicles could be scruitised in 'real-world' driving conditions.

In contrast, the testing of cars is carried out in arguably more favourable conditions in labs using what the group calls "carefully prepared prototype vehicles" supplied by manufacturers.

Changes to the European testing cycle are due to begin in September, with cars also carrying the mobile testing units when driving on real roads for homologation, however Pete Mock, managing director of ICCT in Europe said these changes may not have the desired effect.

"Manufacturers will still be allowed to carefully select special prototype cars for emissions testing. Instead, it would be much better to measure the emissions of ordinary mass-production vehicles, obtained from customers who have had been driving them in an ordinary way," he said.

Mock added that such a system is already used in the US, and said the European Commission is due to discuss the possible use of testing privately-owned cars by third-parties, despite resistance from manufacturers.