Many people in the motor industry will remember the switch from Euro 3 engines to Euro 4 in circa 2005 when the common question in the industry was “will this car meet the Euro 4 emissions standard?”. Almost 10 years later, Euro 6 is just around the corner and the focus on the new standard has been the reduction in Nitrous Oxide (NOx) emissions.
The cut in NOx emissions required to meet the Euro 6 standard has been significant. Euro 5 standard allowed 180mg/km and the Euro 6 standard only allows 80mg/km. To achieve this cap, many manufacturers are opting to fit a fuel borne urea fluid system (commonly known as AdBlue) to break down emissions in the exhaust system. Manufacturers that are currently adopting this approach to reducing emissions include Audi, BMW, Citroen, Ford, Peugeot and Vauxhall.