Unveiled in Frankfurt in 2013, the PSA Group's BlueHDi exhaust line is currently the most effective technology for reducing the pollutant emissions of diesel vehicles. It is fitted on all the diesel vehicles of Citroën. All values quoted in this document are from NEDC laboratory tests.

Up to 90%reduction in NOx emissions

2%to4% reduction in CO2 emissions compared with conventional diesel engines


A pioneer in the field of clean engines, the PSA Group has designed and developed an original technology to treat nitrogen oxide emissions. Selective catalytic reduction (SCR) eliminates the nitrogen oxide (NOx) emitted by diesel engines. The PSA Group is a pioneer and leader in the treatment of particulate emissions Positioned upstream from the DPF, SCR technology constitutes the post-treatment system of the Blue HDi exhaust line, available on all PSA Group vehicles since 2013. It eliminates up to 90% of the NOx emitted by the engine and also further reduces CO2 emissions by 2% to 4% compared with previous engines.