Emission Evolution for Off-Road Equipment

Emission Reduction Image | Doosanequipment EMEA

What did Doosan do to move from Stage I to Stage IV?

  • Stage I : we reduced Nitrogen Oxide (NOx) emissions from diesel machines.
  • Stage II : we focused on reduction of NOx, Hydrocarbons (HC) and Particulate Matter (PM).
  • Stage III : we realised a major reduction in PM and a further reduction in Nox.
  • Stage IV : we reduced NOx levels drastically and also reduced PM again.


To give a better idea of the magnitude of the change, please find below a comparison between emission levels under Stage I and the current Stage IV:

Image catégories d'émissions | Doosanequipment EMEA


Engine output  P CO HC NOx PM
130 ≤ P ≤ 560 kW in g/kWh
Stage I (1999) 5 1.3 9.2 0.54
Stage IV (2014) 3.5 0.19 0.4 0.025
Emission reduction from
stage I to Stage IV in %
- 30% - 85% - 96% - 95%


The emission values and the demands for compliance vary according to engine horsepower. Therefore, the extent and types of changes to our machines varied considerably.

However, a number of core improvements were applied to all our equipment, including turbo-charging, optimisation of the engine combustion system and use of High Pressure Common Rail (HPCR) fuel injection systems.