Consumer need for increased fuel efficiency has pushed an increasing number of automobile owners to invest in diesel engine vehicles. Diesel engines have long been employed in commercial vehicles because their higher torque or 'pulling-power' is better suited to towing heavy loads. Diesel Exhaust Fluid now powers more than 60% of passenger automobiles on European roads. Vehicle manufacturers are helping to reduce the quantity and enhance the quality of vehicle emissions in response to regulatory demands to improve air quality.
SCR and AdBlue have been used in heavy-duty commercial vehicles for some years, and this technology is now being introduced to passenger automobiles with the adoption of the new Euro 6 pollutant emissions standard. To prevent the development of soot and other particles, diesel engines must operate 'lean' (with a higher proportion of oxygen than is theoretically required for full combustion of the fuel). An excess of oxygen causes the formation of nitrogen oxides (NOx), which contribute to ambient NO2 emissions.
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