Blue HDi: making diesel more environmentally respectful

Unveiled in Frankfurt in 2013, the PSA Group's Blue HDi 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 Peugeot, Citroën and DS.

Blue HDi, a unique technology

Diesel is the preferred engine type in France, accounting for a full 64% of registrations in 2014. Blue HDi technology, a major step forward in the reduction of pollutant emissions, reduces the nitrogen oxide (NOx) emissions of diesel engines to levels comparable with those of petrol engines, while safeguarding the intrinsic advantages of diesel engines in terms of driving pleasure, fuel consumption and CO2 emissions.

  • 90 %

    reduction in NOx emissions

  • 2% to 4%

    reduction in CO2 emissions compared with conventional diesel engines

How does it work?

Blue HDi diesel technology is composed of:

  • An additive particulate filter that eliminates 99.9% of particulates by number, regardless of their size and the driving conditions.
  • A post-treatment system called selective catalytic reduction (SCR), positioned upstream of the additive particulate filter and which eliminates up to 90% of the nitrogen oxide emitted by the engine.

* Source: Comité des Constructeurs Français d’Automobiles (CCFA), the French automotive industry. Analysis and statistics. 2015 edition, page 38