Formula
$$ m_{\text{SO}2} = m\text{fuel} \cdot 2 \cdot \frac{S%}{100} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $m_{\text{SO}_2}$ | SO₂ mass emitted | kg | result |
| $m_\text{fuel}$ | Fuel mass burned | kg | DCS record |
| $S%$ | Fuel sulphur (mass fraction) | % | BDN / ISO 8217 |
| $2$ | S→SO₂ stoichiometric factor (64/32) | - | chemistry |
Regulatory caps
| Regulation | Cap |
|---|---|
| MARPOL Annex VI global (from 1 Jan 2020) | 0.50 % m/m |
| SECA (Baltic / North Sea / North America / US Caribbean / Med from 1 May 2025) | 0.10 % m/m |
Sources
- MARPOL Annex VI Regulation 14.