It’s not easy being a driver who wants to do their bit and buy a car with the lowest nitrogen oxide emissions. These NOx are harmful pollutants emitted by cars that are estimated to contribute to over 30,000 premature deaths a year in the UK. Information about a car’s NOx levels has been hard to come by as, for obvious reasons, vehicle manufacturers tend to advertise cars’ fuel economy or performance rather than the nasty particulates pumped out of exhausts.
But now a new website allows drivers to see just how polluting Britain’s most popular makes and model of car are when used in normal, everyday driving conditions.
Called Equa Air Quality Index, the comprehensive database features hundreds of cars that have been put through a special NOx test procedure by Emissions Analytics, a British company.
Why is the NOx test significant?
The test, conducted on roads and adhering to exhaustive, repeatable conditions, is said to bear more relevance to everyday driving conditions that motorists face than current EU emissions testing, which is laboratory based.
And it means that when choosing their next car, drivers can finally have a true picture of how harmful different models are to air quality, as well as knowing whether they can browse Facebook via the dashboard or open the boot by waving their foot beneath the bumper like an over-enthusiastic ballerina.
Understanding how much NOx cars produce is important, as nitrogen oxide is associated with asthma and other breathing conditions. Following the Volkswagen dieselgate emissions scandal, last September, more buyers are conscious that diesel cars emit more NOx than petrol-powered motors.
Which Euro 6 diesel cars emit the least NOx?
- Audi A5 2.0 TDI 161bhp (2014)
- Skoda Superb 2.0 TDI 148bhp (2016)
- Volkswagen Golf SV 2.0 TDI 148bhp (2015)
- Volkswagen Passat 1.6 TDI 118bhp (2016)
- Volkswaegn Scirocco 2.0 TDI 148bhp (2015)
- Volkswagen Touran 1.6 TDI 108bhp (2016)
- BMW 3-series 2.0d 184bhp (2013)
- Volvo S60 2.0d 148bhp (2016)
- BMW 2-series 2.0d 190bhp (2014)
- BMW 2-series 2.0d 150bhp (2014)
Which Euro 6 petrol cars emit the least NOx?
- Audi A1 1.4 123bhp (2015)
- Audi A3 1.4 148bhp (2015)
- Audi A4 2.0 187bhp (2016)
- Audi RS3 2.5 362bhp (2016)
- BMW 1-series 1.5 134bhp (2015)
- BMW X5 4.4 575bhp (2015)
- Hyundai i20 1.4 99bhp (2015)
- Hyundai i30 1.6 183bhp (2015)
- Infiniti Q30 1.6 120bhp (2016)
- Kia Sportage 1.6 174bhp (2016)
How are cars’ NOx levels graded in the test?
The Equa Air Quality Index grades cars on a sliding scale, A being the best, and H being the worst.
A means a diesel car’s NOx emissions met Euro 6 regulations, and that a petrol car’s NOx emissions met Euro 4 regs. H means it is roughly 12 times over the Euro 6 legal requirement.
All the petrol cars in the top 10, above, scored an A rating, whereas some of the diesels (from the Volvo S60 and below) fell into band B.
Which were the worst performing diesel and petrol cars for nitrogen oxide emissions?
According to the Equa testing, the worst performing diesel car is the 2015 Fiat 500X 1.6 118bhp, a popular compact crossover often spotted around town. It was rated in band H. The worst performing petrol vehicle was a 2015 Ford Focus 1.0 123bhp, one of the UK’s best-selling cars, and rated in band E.
When will a new emissions and fuel economy test be introduced?
The Equa Air Quality Index highlights the disparity between what cars achieve in current EU lab tests, and how they perform in the hands of motorists. The industry recognises the need for change, and is working toward a new testing procedure – known as Worldwide Harmonised Light Vehicles Test Procedure (WLTP) – for introduction next September. It has been designed to better reflect day-to-day driving and remove loopholes that allowed car makers to effectively cheat tests.
The Society of Motor Manufacturers and Traders said: “Cars approved for sale meet the legal limits under the EU lab-based testing regime. There are no limits for NOx emissions in the real world. We recognise this needs fundamental reform.”