A study released March 13 revealed new diesel cars sold in the UK are 21 percent less polluting and 27 percent more economical than they were in 2003.

The study also stated in the past decade, the increasing number of diesel cars fitted with advanced components, such as common-rail diesel and Start-Stop, have benefited from significantly reduced emissions and lower running costs.

This is all according to the UK’s Society of Motor Manufacturers and Traders’ New Car CO2 Report.

“Motorists today benefit from much cleaner diesel cars than those that were on the market even ten years ago,” said Peter Fouquet, President of Bosch UK. “As diesel car sales continue to rise, we are focused on constantly innovating new technologies that help reduce emissions from diesel cars and make them cheaper to run.”

Bosch stated one of the first major innovations in diesel car technology was the introduction of turbochargers in 1980s models, which helped reduce emissions and made the engines more efficient. The Audi 100 TDI was one of the first cars to use Bosch turbodiesel technology in 1989.

The next major change for diesel cars, added Bosch, was the introduction of the common-rail system, pioneered by Bosch, which injected fuel into the engine at a higher pressure, making it more efficient. The first car to use this Bosch technology was the Alfa Romeo 156 2.4 JTD in 1997. More recently in 2004, Bosch further developed this system to inject the fuel at even higher pressures, making diesel car engines more efficient than ever before. Bosch added this development has helped reduce emissions by up to 15-20 percent.

One of Bosch’s latest milestone innovations was the introduction of Start-Stop into cars starting in 2007, said the company. Today, Start-Stop is on every other new car manufactured in Western Europe and helps to reduce their emissions by up to 8 percent, added Bosch.

Bosch also declared it will continue to develop diesel technology to improve its efficiency and deliver improvements for the environment and for motorists, which is likely to include hybrid vehicles.

The first diesel hybrid production car was brought to market in 2011 by Peugeot, using Bosch technology to help its crossover vehicle, the 3008 HYbrid4, achieve CO2emissions of 99g/km. Bosch believes Hybrid diesel technology can reduce fuel consumption in diesel cars by around 40 percent and will help manufacturers meet the European 2020 emissions target for new cars, which is at CO2 emissions of 95g/km.