| Oxide | New Engine | Regulation | Known as | Existing Engine | NOx limits | Remarks |
| NOx | fuel: diesel | 13, up to 3.4 g/kWh emissions | Tier III (effective 2016 in NOx ECAs); Otherwise Tier II (effective 2011 requiring 14.4 g/kWh) | Diesel > 5000 kW, of vintages 1990-2000 | Tier II Tier I | Tier I: 17 g/kWh (since 2000) 12 months after the Administration notified IMO |
| SOx | Date | Limit | A new limit | SOx | Date | A new limit |
| Global cap | 2012 | 4.5% | 3.5% m/m (mass per mass) |
| 2020 | 0.5% |
| In ECAs (*) | 2010 | 1.5% | 1% since 2010 | 0.5% m/m since 2020 | 2015 | 0.1% m/m, if such fuel exists; if not, goes to 2025 |