Bosch is one of the world’s leading suppliers of diesel fuel injection systems and is standard equipment on many diesel engines today. Thanks to new test procedures and engineering ingenuity from Bosch, a decisive technological breakthrough has now been achieved with regard to improving air quality. The new, enhanced diesel technology will result in a further shift in the limits of what has been feasible so far, leading to a sustained reduction in nitrogen oxide emissions. This technological breakthrough can make the diesel about as clean as a gasoline engine. It means diesel is therefore still an affordable alternative for urban traffic and in the future will be an ecologically sound one too.