Selective catalytic reduction (SCR) technology is a PSA Group innovation that eliminates nitrogen oxide.

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.

  • 90 %

    reduction in NOx emissions

  • 2% to 4%

    reduction in CO2 emissions

The PSA Group is a pioneer and leader in the treatment of particulate emissions

Launched in a world first in 2000, the additive particulate filter (DPF) developed by PSA Group eliminates 99.9% of the number of particulates and today stands as the most efficient solution on the market.

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 90% of the NOx emitted by the engine and also further reduces CO2 emissions by 2% to 4% compared with previous engines.