For several years Doosan has been working hard to ensure our products are compliant with federal emission standards for non-road equipment. With interim Tier 4 (iT4) and Tier 4 (T4) emission standards, engine modifications aren't enough. Therefore, a systems-based clean diesel approach is needed including internal engine modifications, after-treatment technologies, and advancements to diesel fuel.

This clean diesel technology will greatly reduce the levels of harmful emissions such as particulate matter (PM) and Nitrogen Oxides (NOx) that enter the air. The standards will improve air quality and public health for generations to come.

EMISSIONS STANDARDS HISTORY
Tier 4 standards are part of a broader federal effort to ensure a sustainable environment. Learn the history of Tier 4.

EMISSIONS EVOLUTION FOR DOOSAN EQUIPMENT

Since 1996, Doosan machines have been changing to meet the various tiers of emissions standards. Review the tiers and requirements.

INTERIM TIER 4 (iT4) AND TIER 4 (T4) TECHNOLOGIES

Engine advancements and after-treatment systems will be common in many interim Tier 4 (iT4) and Tier 4 (T4) compliant machines. See the Tier 4 clean diesel technologies.

DOOSAN TECHNOLOGY STRATEGY
To meet the iT4 regulations, Doosan is utilizing several technologies for its excavators, wheel loaders and articulated dump trucks.  Review the Doosan Strategy. 

EMISSIONS STANDARDS RESOURCES
Doosan has compiled many resources to help you learn more about Tier 4. Link to other Tier 4 information.