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Prevention of Air Pollution: NOx Emissions limits for new engines Purpose,The Marine Environment Protection Committee (MEPC 58) of the International Maritime Organization (IMO)
Applicable to:
All stakeholders
Effective Date:
25.11.2008
Superseded Circulars:
None mentioned
Key Changes and Requirements
1. NOx Emission Limits for New Engines
The MEPC 58 of IMO approved a three-tier structure for new engines with progressively tighter NOx emission standards.
- Tier I: 17 g/kW (2000-2010)
- Tier II: 14.4 g/kWh (2011 onwards)
- Tier III: 3.4 g/kWh (2016 onwards in ECA)
2. NOx Emission Limits for Existing Engines
Engines >5000 kW, displacement >90L/cylinder, installed 1990-2000 must meet Tier I (17 g/kW) limits.
- Compliance: Certification or upgrade to Tier I limits
- Upgrade Deadline: First renewal survey after upgrade system's commercial availability
Annex VI of MARPOL - More details
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