Cargo-owner-driven 0–100 index across five environmental categories.
Formula
$$ \text{CSI} = \tfrac{1}{5}(s_\text{CO2} + s_\text{NOx} + s_\text{SOx} + s_\text{chem} + s_\text{waste}) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $s_\text{CO2}$ | CO₂ per tonne-nm score (higher is better) | 0–100 | CSI questionnaire |
| $s_\text{NOx}$ | NOx per kWh score | 0–100 | NOx Technical File |
| $s_\text{SOx}$ | SOx + PM score (sulphur + PM abatement) | 0–100 | bunker / scrubber data |
| $s_\text{chem}$ | Chemicals score (antifouling, lubes, grey water) | 0–100 | IHM / operator declaration |
| $s_\text{waste}$ | Waste-management score | 0–100 | ISM audit |
Letter bands: A ≥ 80, B ≥ 60, C ≥ 40, D ≥ 20, E < 20.
Sources
- Clean Shipping Index - cleanshippingindex.com.
- Smart Freight Centre (inheritor of Clean Cargo Working Group).