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What is the Tier / Stage emission standard?

TIER - the emission standard of North America, its European equivalent is the STAGE emissions standard.

Both standards apply to exhaust emissions in specialized vehicles such as agriculture, construction, etc.

Table showing the Tier and STAGE standards
HC - węglowodory
NOx - tlenki azotu
PM - cząstki stałe

To achieve the lowest emissions of NOx NOx, manufacturers use the Selective Catalytic Reduction (SCR) system from Interim Tier 4 / Stage IIIB.