EQUA Air Quality Index Audi A3

New EQUA ‘NCAP for NOx emissions’ test ranks real-world car pollution

EQUA Air Quality Index Audi A3Emissions Analytics has launched the first fully independent index-based NOx emissions standard for cars and the UK firm claims the new EQUA Index provides a level playing field “to help clear the confusion over real world NOx emissions”.

The new EQUA Air Quality Index has been developed from Emissions Analytics’ existing real-world car economy test. Purely assessing NOx (nitrogen oxide) emissions, it gives a simple score from A to H for all cars tested.

An A rating means a car meets current NOx limits for diesel and petrol cars: an H rating is worse than even the very oldest Euro emissions standard – equivalent to 12 times the current Euro 6 limit. The ratings are explained in full below.

Alarmingly, more than 50 older Euro 5 diesels scored an ultra-dirty H rating, along with three current-standard Euro 6 cars – and a supposedly-green diesel-hybrid model, the Peugeot 3008 Hybrid4, was also given a worst-possible H rating.

The EQUA Air Quality Index has been launched with ratings for 440 vehicles and the firm has vowed to test 200-400 new cars each year to ensure the rankings are as up-to-date as possible.

> Search the EQUA Index database

Nick Molden, CEO and founder of Emissions Analytics, said: “There’s a great deal of confusion among car buyers on the subject of pollutant emissions, but we’re able to deliver impartial and precise information to help them buy better.

“We’re also looking forward to working with the industry as a whole to highlight the best vehicles available.”

EQUA Air Quality Index: the winners and losers

Volkswagen Group cars are the big winner of the EQUA Air Quality Index tests. A batch of its latest Euro 6 diesels have been tested – and of the six cars assessed, all six have achieved the very cleanest A-rating, suggesting tailpipe NOx emissions are exactly what Volkswagen claims in real-world use.

Proof that no defeat devices are active on the latest models..?

The BMW 3 Series also achieved an A-rating for real-world Euro 6 diesel emissions – the only other Euro 6 diesel to do so: of the 62 latest-spec cars tested, three scored B-ratings, 9 were rated C, 13 were rated D, a worrying 20 were rated E, five scored F, two G and three the very worst H rating.

These models were the Fiat 500X 1.6-litre diesel SsangYong Korando 2.2-litre diesel, plus the 2013 Audi A8 3.0-litre diesel that’s no longer on sale (an indication that defeat device systems could be active on in-market Volkswagen Group cars?).

In contrast, all but four of the 45 Euro 6 petrol cars tested were rated A, suggesting the latest diesel models in particular have an issue with hitting Euro 6 NOx targets in real world use. All diesels, that is, except Volkswagen Group diesels…

Every single Euro 6 hybrid vehicle also achieved an A-rating.

As for Euro 5 diesels (which were applicable for new cars in showrooms up until September 2014 for newly-launched models and September 2015 for existing on-sale in-market motors), things are far worse.

Not a single Euro 5 diesel car scored an A-rating, or a B-rating: the best model was the Skoda Octavia 1.6-litre TDI, with a C-rating. Then it was five D-rated cars (proving Euro 5 cars can only meet Euro 4 limits), followed by a staggering number of E, F, G and H-rated cars.

Such H-rated models include best-sellers such as the BMW 1 Series, Mercedes-Benz C-Class, Nissan Qashqai, Renault Clio, Vauxhall Corsa and, yes, the 1.6-litre Volkswagen Passat.

However, all but eight of more than 100 older Euro 5 petrol cars tested failed to score the very lowest A-rating for NOx emissions. Does this mean air quality campaigners are right to focus on getting older diesel models off Britain’s roads?

EQUA Air Quality Index table

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