MARPOL Annex VI - NOx Tier III Limit
NOx emission limit for Tier III (ECA) per MARPOL Annex VI Reg. 13 - keel dates ≥ 2016-01-01 operating in North American / US Caribbean / Baltic / North Sea ECAs.
NOx limit Tier III
3.40g/kWh
Formula, assumptions, and limits
~80 % reduction vs Tier I. Compliance typically requires SCR (selective catalytic reduction) or EGR (exhaust gas recirculation) on 2-stroke engines; Ga+ mode switching between Tier II and III.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Rated engine speed | rpm | engine nameplate |