AIR – a new global alliance promoting on-road vehicle emissions tests

Sept 26 2017 saw the launch of a new global alliance promoting the voluntary adoption of an independent on-road vehicle emissions test and rating system – AIR – Allow Independent Road testing. A comprehensive factsheet detailing the background behind the formation of AIR, its values, its methodology, and its objectives is included below

Euro 6 cars entering Clean Air Zones

Infographic showing the percentage of Euro 6 diesels tested that meet the Euro 6 standard for NOx emissions

Why cold starts could freeze air pollution improvements

The latest analysis of the EQUA Index data shows that the average daily distance driven in passenger cars is not sufficient for a vehicle’s pollution control system to warm up and become fully functional. The resultant high levels of cold start NOx emissions, from both gasoline and diesel engines, could provide an additional challenge for … Read more

Vans weigh in on the EQUA Index

Vans weigh in on the EQUA Index Light commercial vehicles (LCVs) travelled 48.5 billion miles last year according to the Department for Transport[1]. In its tests, Emissions Analytics has seen similar levels of variability from official fuel economy and emissions figures in vans as in cars. With van mileage growing by an average of 4.1% … Read more

The EQUA Mpg gap increases further in 2016

This year’s round up of EQUA fuel economy data shows a five percentage point increase in the gap between official and real-world mpg, reaching 29% in 2016. Official mpg figures averaged 60.7mpg in the year, the highest we have seen since we started recording in 2011. This is an increase of 9% on 2015’s figures, which stood at … Read more

Can hybrid electric vehicles beat diesels on mpg?

Hybrids have always had a miles-per-gallon advantage in urban driving but new EQUA Index data shows that they are gaining on diesels in motoway or highway driving and, if current trends persist, hybrid electric vehicles (excluding plug-in hybrid electric vehicles) are set to take the lead in 2017. The dotted trend lines in the above graph, … Read more

Are diesels done for?

As the government loses a second high court ruling brought by ClientEarth, many are now sounding the death knell for diesel cars. Not so fast, says Emissions Analytics, diesels can be clean and govenments are highly unlikely to give up the greenhouse gas advantage of diesel in the short- or medium-term. Since the introduction of … Read more

Emissions Analytics launches EQUA Carbon Monoxide Index

Emissions Analytics is pleased to announce the launch of the EQUA CO Index. The second in the EQUA Index series, EQUA CO looks at whether carbon monoxide regulations are being achieved in real-world operation. Potentially fatal for humans as well as damaging to the environment, carbon monoxide is generally considered a problem primarily confined to … Read more

Thermal windows: the next big scandal or an innocent technicality?

Recent months have seen a growing a body of evidence, from different sources, that NOx emissions from cars are higher when the ambient temperature is lower.  This month, Emissions Analytics mined its real-world database to assess the evidence. The accusation is that NOx reduction devices, including exhaust-gas recirculation, are programmed for reduced operation below the 20°C … Read more

New EQUA Index reveals true pollutant emissions for car buyers

With Mitsubishi Motors the latest manufacturer to admit to impropriety in its testing procedures, the need for impartial real-world data has never been greater. Today Emissions Analytics is launching the new EQUA Index rating scheme to help bring transparency in the first instance to the issue of air quality. The EQUA Air Quality Index is ... Read more

Snapshot #9: Class matters when it comes to MPG

We looked at our data on over 750 EU cars tested, to see how much of an influence vehicle class was on variance between the NEDC-derived official MPG and our cycle and found: Petrol sports cars come closest to their official figures The MPG gap is worse for small cars, whatever the fuel Overall the gap is almost always bigger for diesel engines.

Do a PhD with King’s College London and Emissions Analytics

Characterising non-road mobile machinery emissions through portable emissions testing and emissions inventory development An exciting opportunity exists to investigate the emissions from vehicles and generators on construction sites working with academic, industry and government partners to deliver a scientifically ground breaking and policy relevant PhD. Current emissions inventories estimate that Non-Road Mobile Machinery (NRMM) contributes … Read more

Has fuel economy started to fall?

Average fuel economy has fallen for the first time since Emissions Analytics began its real-world test programme in 2011. Not only that but the ‘gap’ between official figures and our results did not widen last year. The reason for this appears to be intrinsically linked to the introduction of the Euro 6 emissions standards. This … Read more

WANTED: Technician to join the UK team

Job title: Vehicle Emissions Technician Location: South West London Job type: Full time, permanent Salary:  £22-27k Are you a car enthusiast? Do you have practical experience of the maintenance and use of technical equipment? Are you organised, thorough and capable of seeing a project through to the end? Numerate and computer literate Self motivated and … Read more

Cargo weighs heavily for some LCVs

You may remember back in February we announced we were going to extend our test programme to include light commercial vehicles. Well, testing has been underway for the last few months and we have found that fuel economy and nitrogen oxide (NOx) emissions vary considerably depending on whether or not vehicles are fully laden.  Our sample … Read more

Real Driving Emissions – How REAL is it?

With the recent Volkswagen scandal focussing the world’s attention on the air quality problems associated with diesel cars, campaigners for clean air have expressed dismay over the EU’s decision not to impose stricter rules for testing new cars on the road. However, Emissions Analytics data shows that full compliance with the Euro 6 limits on … Read more

Consumers being mislead on emissions – with or without illegal acts

We set up Emissions Analytics four years ago to understand the differences in emissions and fuel economy between the laboratory test and real-world driving conditions in Europe and the United States.  Over that time, Emissions Analytics has tested over 1000 cars in Europe and the United States, including over 200 European diesel passenger cars, and … Read more

Air quality…it’s hotting up

Will 2015 be recognised as a turning point in the campaign for clean air? It certainly has the potential to as there are a number of threads which, if they come together, could determine the future prospects for urban air quality in Europe. For instance, the second stage of the Euro 6 regulations for passenger cars will come into … Read more

Time to decide the car for our 1000th test

Since rigging our first car with PEMS equipment in 2011, we have tested almost 1000 vehicles. To mark this milestone we want you to suggest our 1000th automobile. To give you some ideas we have put together a summary of the best performers, the worst and everything in between. Plus our testers have shared their … Read more

Do the benefits of stop-start technology outweigh the irritations?

The principle behind stop-start technology makes sense. Turn off your engine whilst it is not needed, for instance at red traffic lights, and you will save fuel and reduce emissions. However, at EA we wanted to know just how much of a difference it really makes and so we mined our database of 900 real … Read more

Revealed: Annual MPG Report Card

Real-world fuel economy hardly growing Evidence from our large-scale test programme of passenger cars in Europe reveals the difference between the official fuel economy figures for new cars and their real-world results is continuing to grow. The latest examination of our data shows that the gap between the combined New European Driving Cycle figures and our … Read more

The end of the road for dirty diesels?

We have been listening to the proposals to discourage ‘dirty diesels’ by cities across Europe, and read with interest the statement from the Society of Motor Manufacturers and Traders (SMMT), speaking up in favour of the diesel car. In our opinion, the evidence from real-on-road tests speaks for itself. Our research shows Euro 5 standard … Read more

Weighing the cost of a new van

EA is in the business of improving the quality and availability of data in the automotive sector and so we will soon be introducing on-road testing for light commercial vehicles in the UK, helping consumers make informed decisions about which vehicle to buy with an easy to use miles per gallon calculator. A major contributing factor to fuel economy for … Read more

Ploughing ahead with tractor testing

Working with Emissions Analytics, engineering researchers at Harper Adams University have developed a new method to accurately measure the exhaust emissions of agricultural machinery. Traditionally, machines such as tractors are tested in controlled environments such as a soil hall, not taking into account the many variables from real-life scenarios, which result in transient engine loads. … Read more

Real Driving Emissions – are you ready?

Emissions Analytics was recently asked to write an article for Automotive World’s Megatrends magazine. This month’s newsletter is a summary of that article which considers the potential impact of the proposed changes to the New European Drive Cycle. Emissions Analytics’ data resource, from tests on more than 800 vehicles, is transforming the economics of obtaining … Read more

Hybrid efficiency put to the test

Despite common perception, the advantage of hybrids over frugal diesels is often illusory, if judged solely on fuel economy. Having tested over 30 hybrids in the UK and US, Emissions Analytics is able to analyse the data to understand how they really perform. To illustrate the point we have taken a sample of 10 vehicles tested … Read more

Beware the danger of downsizing

The old adage that good things come in small packages is not necessarily true in the automotive sector, at least not when it comes to engine size. Looking at the data in the table below, based on real-world tests from over 500 model variants, it can be seen that engines under one litre have the … Read more

Out and about in September

After the relative calm of the holiday period, September is ramping up to be a busy month for Emissions Analytics. We are taking to the road (and sky) for a number of speaking engagements at events and conferences around the world. We would love the chance to meet up so if you are going to … Read more

Measuring the manufacturers: The EA league table

As promised last month we are going to examine our fuel economy data in more detail, particularly looking at how different manufacturers perform. Of the 459 vehicles included in this study, spread across 26 manufacturers, the average real-world mpg by OEM ranges from 31 to 54mpg, with a mean of 44mpg. The deficit from the … Read more

Do we still need to mind the MPG gap?

The gap between official miles per gallon and real world mpg has grown to 22%. This is up 5% since we first started testing fuel economy almost three years ago. The average official combined miles per gallon of the 459 passenger cars we have tested is 57 and this is increasing by approximately 1.7 mpg per … Read more

Do eco tyres really save you money?

Preliminary tests have shown that ratings on tyre labels are not telling the full story. At mid-range speeds, an F-rated tyre performs as well as a B-rated tyre for fuel economy. We tested two contrasting sets of 175/70 R14 tyres on the road. One set was a standard tyre with B-rating for fuel economy and … Read more

Air-con on in the sun?

In the knowledge that the readership of this newsletter extends far beyond those of us expecting a traditionally wet British summer, this issue looks at air conditioning and its impact on fuel economy. From our test centre in Los Angeles, where they are lucky enough to need air conditioning most of the year, we test … Read more

March 2014 – Transatlantic testing

This month, in preparation for a presentation we are giving at the 24th CRC Real World Emissions Conference in San Diego, we have been making a detailed examination of the data we are collecting in America. In most respects the emissions testing we perform in the USA is identical to the work we do in … Read more

February ’14 – NOx in the News

NOx in the news In the press last week was the news that the European Commission has launched legal proceedings against the UK for failing to deal with air pollution. Britain was supposed to meet EU limits set out in the Air Quality Directive by 2010 but the government has said these levels will not … Read more

Speed Demonisation

Changing speed limits on the UK’s roads is hardly out of the news at the moment. For instance, various London boroughs, including Camden and Islington, have recently announced a reduction in the speed limit from 30mph to 20mph to improve road safety. In 2011, the government briefly toyed with the idea of increasing motorway speed … Read more

A year of data from Emissions Analytics

Emissions Analytics specialises in the analysis and interpretation of complex data sets. So here is a festive round-up of a few of our own numbers for the year: True MPG results supplied to What Car? for 186 vehicles in 2013 Launch of Real MPG for Motor Trend magazine in the USA, 71 cars tested so far 16,000 miles … Read more


There are two types of diesel particulate filter (DPF) regeneration which can occur without external intervention by the driver or a mechanic. The first is passive regeneration which happens when high exhaust temperatures reached during intensive use (normally either long spells of motorway driving or hill climbing) automatically burn off the trapped diesel particles. The other is … Read more