The evolution of diesel and the many secrets of Euro 6

What the Euro 6 emission regulations mean for the UK car buyer – and why the latest diesels are the cleanest ever

Diesel fuel
Current diesel prices stand at 134.6p per litre
(Image credit: Daniel Leal-Olivas/AFP/Getty Images)

As our understanding of the impact vehicles have on the environment and the technology available to car makers increases, there are ever-tighter controls on vehicles’ emissions.

These aim to strike a balance between reducing harmful gases and not pricing motorists out of cars. The European Union has, since 1993, established a series of ever-tighter regulations, which continue to apply to cars sold in the UK.

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PollutantDescription
Mass of carbon monoxide (CO)A harmful waste gas produced as a result of burning fuel.
Mass of total hydrocarbons (THC)Left over, unburnt fuel emitted from a car’s exhaust pipe
Mass of non-methane hydrocarbons (NMHC)A group of waste chemicals that include cancer-causing agents like formaldehyde and benzene.
Mass of oxides of nitrogen (NOx)Nitric oxide and nitrogen dioxide –unpleasant waste gases linked to lung disease, allergies and environmental damage.
Combined mass of hydrocarbons and oxides of nitrogen (THC + NOx)These components are measured both individually and together, as they react and combine differently in different engines; when combined they create smog.
Mass of particulate matter (PM)Microscopic iron oxide and soot particles, and other harmful solid waste products.
Particle number (P)How many soot and solid particles are found in a given volume of gas and therefore how large the particles are. In terms of human health, smaller particles are more harmful.*
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